Melatonin for ADHD
Melatonin is a hormone. It is produced by the pineal gland from tryptophan via several intermediate steps. The onset of darkness (the loss of melatonin-inhibiting brightness) is registered via the retina and stimulates melatonin production via the suprachiasmatic nucleus in the hypothalamus. Melatonin regulates the circadian rhythm. Blind people often have sleep problems and benefit from melatonin supplementation.1 In Germany, immediate release melatonin is freely available up to a dose of 1 mg.2 In the USA, melatonin is freely available as a dietary supplement. In other countries, such as Australia and Scandinavia, melatonin is only available on prescription.
Melatonin appears to be an effective, tolerable and safe treatment for comorbid sleep disorders in both adults and children with ADHD. We are not aware of any reports of inappropriate side effects.
Problems falling asleep and staying asleep occur in 15 % to 25 % of all children and adolescents and in 25 % to 50 % of those with ADHD. Several studies and reviews show the benefits of melatonin for sleep disorders, especially in children and adolescents with ADHD, ASD or other neuropsychiatric disorders, with minimal side effects.3 There is limited data on the safety and efficacy of long-term use of melatonin.45 Others report 75% circadian disorders in children and adults with ADHD.6
A systematic review of 62 studies totaling 4,462 ADHD subjects found consistent evidence that ADHD is associated with an evening/late chronotype and phase delay of circadian phase markers such as weak melatonin onset at dusk and delayed sleep onset. There was evidence that melatonin is an effective treatment for sleep problems in ADHD. A small number of genetic association studies reported links between polymorphisms in circadian clock genes and ADHD symptoms. Overall, there was consistent evidence of a disorder of the circadian rhythm in ADHD7
Several other meta-analyses and reviews on sleep problems in children and adults with ADHD also confirmed that melatonin can shorten the time it takes to fall asleep and improve sleep quality without any significant side effects.891011
For ADHD-related sleep problems, immediate release melatonin between 0.5 and 3 mg is recommended (plasma half-life approx. 20-50 minutes, duration of action 3-4 h), which should be taken at least approx. 1 hour before bedtime and not after midnight.12
If you have problems sleeping through the night (more typical in older adults), sustained release melatonin may be useful.
- 1. Melatonin against sleep disorders
- 2. Dose and timing of melatonin intake
- 3. Miscellaneous about melatonin
1. Melatonin against sleep disorders
1.1. Melatonin for sleep disorders in children and adolescents
1.1.1. Melatonin for sleep disorders in children and adolescents with ADHD
According to various studies, melatonin is also effective for sleep problems in children with ADHD,1314 15 16 17 while melatonin has no direct effect on the ADHD symptoms themselves.18
In a study of 74 children and adolescents with ADHD (mean 11.6 years) receiving MPH, 60.8% showed a large or very large improvement in sleep behavior on melatonin treatment (mean dose 1.85 mg/day).19 One small study found improved sleep onset behavior, fewer sleep throughs and more sleep with melatonin in a group of children with mental disorders, including ADHD. There were no serious side effects.20
A systematic review on the treatment of sleep problems in ADHD in children and adolescents found a positive effect of melatonin on falling asleep, sleep duration and sleep quality. Clonidine also improved insomnia (which is why we suspect the same for guanfacine), while zolpidem and L-theanine barely showed any improvement.21
A meta-analysis on the use of melatonin for the treatment of sleep problems in children with ADHD reports that melatonin is often prescribed as an adjunctive pharmacotherapy when optimization of stimulant adjustment, sleep hygiene and behavioral therapy have not been sufficient. Melatonin regulates sleep disorders in the circadian rhythm, such as difficulty falling asleep in children with ADHD. Four studies in children aged 6 to 14 years with ADHD and insomnia showed an improvement in sleep onset and sleep latency. Adverse events were transient and mild in all studies.22 Another meta-analysis also found a significant improvement in sleep duration and sleep onset latency in children with ADHD or ASD compared to placebo, with a high response rate. Melatonin was well tolerated in the dose range of 2 to 10 mg/day in children and adolescents in both short and long application tests with few side effects.23 Further reviews support these results.2425
A meta-analysis found that melatonin brought forward the time it took to fall asleep by 40 minutes and reduced the time it took to fall asleep by 24 minutes in children and adults with sleep onset disorders.9
A cohort study from Sweden showed that in 2017, around 2% of all children aged 0 to 17 had been prescribed melatonin at least once. Overall, melatonin prescriptions increased 15-fold for girls and 20-fold for boys between 2006 and 2017. 15% of girls and 17% of boys who were prescribed melatonin for the first time between the ages of 5 and 9 in 2009 continued to be prescribed melatonin for the following 8 years. Half of the children prescribed melatonin had at least one mental Disorder. The most common mental disorder was ADHD, in all age groups and in both sexes.26
This is in line with another Swedish cohort study, according to which 40% of girls and 50% of boys aged 5 to 9 years who regularly received melatonin in 2010 continued to receive melatonin regularly after 3 years. Among 15 to 19-year-olds, only around 10% were still regular users 3 years later. In 2013, 65% of boys and 49% of girls who were regular melatonin users were also regular users of ADHD medication. The daily dosage of melatonin appeared to have decreased by almost 30% between 2006 and 2012.27
A Norwegian cohort study also shows a continuous increase in the use of melatonin (off-label in Norway), whereby mainly sleep problems that occurred comorbidly with other disorders were treated. A large number of children continued treatment for 3 years with daily dosing. The annual average dosage in the third year was 2.95 mg (1.60 to 4.93 mg) / day for boys and 2.47 mg (1.10 to 4.44 mg) per day for girls.28
A very large cohort study of 48,296 people with ADHD between the ages of 0 and 17 from 2008 to 2012 found that 30% of them received other medications in addition to ADHD medications, with melatonin being the most commonly given other medication, ahead of antidepressants and antipsychotics.29
In view of these dimensions, it is difficult to imagine that melatonin would have been used without corresponding benefits or that serious side effects of melatonin would not have been noticed.
In a Canadian survey, melatonin was the most commonly used medication by doctors for sleep disorders in children (73%), regardless of co-existing ADHD.30
A Japanese survey showed that almost half of the children with difficulty falling asleep were treated with melatonin (n = 220). The following study showed effective doses between 0.2 and 8 mg, depending on age (n = 254).31
1.1.2. Melatonin for sleep disorders in children and adolescents with autism
Doses of 1-4 mg 30-60 minutes before bedtime significantly improved sleep onset latency.3233
1.2. Melatonin for sleep disorders in adults with ADHD
1.2.1. Melatonin for sleep disorders in adults with ADHD
In a review of 41 studies, an international group of experts concluded that sustained release melatonin (2 - 10 mg, 1 - 2 hours before bedtime) in adults with insomnia symptoms or comorbid insomnia in affective disorders, schizophrenia, Autism spectrum disorders, neurocognitive disorders or during the discontinuation of sedative-hypnotics, while in adults with disorders associated with circadian sleep problems (such as ADHD), immediate release melatonin (1 mg and less) is more useful.34
A French expert commission found melatonin to be a helpful medication for adults with sleep disorders and comorbid mental disorders such as ADHD35
A meta-analysis found that melatonin in children and adults with difficulty falling asleep brought forward the time taken to fall asleep by 40 minutes and reduced the time taken to fall asleep by 24 minutes. (METASTUDY, k = 9)36
1.2.2. Melatonin for sleep disorders in older adults with primary insomnia
In older adults (55 years and older), 2 mg sustained release melatonin shows better effects, especially on sleep efficiency, than immediate release melatonin.37
2. Dose and timing of melatonin intake
Depending on when melatonin is taken, it has different effects.
Taking 2 to 4 mg immediately to (ideally) 3 hours before sleep onset shortens the time it takes to fall asleep and improves sleep quality without affecting the circadian rhythm.
Taking it 7 hours before the onset of sleep (lower doses here) shifts the circadian rhythm forward, thereby also improving the latency to fall asleep and the quality of sleep. There are also indications that this could reduce existing ADHD symptoms.
Glossary:
- Sleep latency (SOL):
- Time from going to bed / lights out to the first onset of sleep. Measured in minutes. Less is better.
Wake after sleep onset (WASO): Sum of all waking phases after first falling asleep until final awakening in the morning. Measures sleep continuity / ability to sleep through the night. Lower is better.
- Time from going to bed / lights out to the first onset of sleep. Measured in minutes. Less is better.
- Sleep efficiency (SE):
- Percentage of time spent in bed actually sleeping. Values ≥ 85% are conventionally considered normal. Higher is better,
Calculation of sleep efficiency (SE) = Total Sleep Time (TST) / Time in Bed (TIB) × 100 %
- Percentage of time spent in bed actually sleeping. Values ≥ 85% are conventionally considered normal. Higher is better,
- Total sleep time (TST):
- Total time slept in minutes. Higher is better.
- Sleep quality (SQ):
- Definition depends on the study. Sleep quality can be a subjectively reported value, standardized e.g. via Pittsburgh Sleep Quality Index (PSQI), sleep diary or Insomnia Severity Index (ISI), or a value measured by actigraphy / PSG, which can take several parameters into account: SE, WASO, number of awakenings, sleep architecture (% N3, % REM), sleep fragmentation index, SOL if applicable.
2.1. Melatonin (up to) 3 hours before sleep: improves sleep (falling asleep)
While unretarded melatonin taken 7 hours before or several hours after bedtime shifts the circadian melatonergic rhythm forward or backward, unretarded or sustained-release melatonin taken immediately before sleep has little effect on the DLMO.
Melatonin reached its maximum efficacy in children at a dose between 2 and 4 mg/day, 3 hours before bedtime. This correlated (meta-analysis, k = 21)38
- a reduction in the time it takes to fall asleep with an early intake in relation to bedtime
- an increase in sleep efficiency and total sleep time with a longer treatment duration
In adults, doses of 3 (to 5) mg 3 hours before sleep onset were optimal to reduce sleep onset latency and increase sleep duration. In contrast, most studies used 2 mg melatonin 30 minutes before bedtime. (Meta-analysis, k = 26 RCT, n = 1,689)39 Studies with a dose of more than 3.5 hours before sleep onset were not included in the meta-analysis. Up to a dose of 3 to 5 mg, the pooled sleep onset latency decreased, above which it slowly increased again. Interestingly, a dose of 1 mg was even associated with worsened results. In patients with insomnia, melatonin was less effective than in healthy controls, and the efficacy of melatonin gradually increased as the time of administration was brought forward in relation to the sleep phase.
Melatonin for direct sleep promotion: 45 studies + 1 meta-analysis on intake max. 2 hours before sleep onset
| Target group | Dose | Intake (in min / h) before bedtime | Number of subjects | Improvement in sleep onset latency (SOL) | Improvement in sleep duration (TST) | Improvement in sleep quality (SQ) / sleep efficiency (SE) | Study |
|---|---|---|---|---|---|---|---|
| _________________ | _________ | ___________ | ___________ | ___________ | |||
| ADHD: Children and adolescents with sleep problems | |||||||
| Children with ADHD, 6-14 y. on stimulants (non-responders to sleep hygiene) | 5 mg immediate release | 20 min before bedtime | n = 27 | 60 min faster with sleep hygiene + melatonin | unknown | improved, ADHD symptoms unchanged | Weiss et al., 200640 |
| Children with ADHD under MPH 1 mg/kg, 7-12 y. | 3 or 6 mg melatonin immediate release or placebo | 30 min before bedtime, 8 weeks | N = 50 | Sleep onset significantly earlier; bedtime resistance reduced | significantly increased | Sleep quality improved; ADHD symptoms unchanged | Mohammadi et al., 201241 |
| Children with ADHD and MPH-induced insomnia, 9.5 to 14 years | Mean dose 1.85 mg immediate release (titrated in 0.5 mg increments, 1 to 2.7 mg) | 60-120 min before bedtime, ≥ 4 weeks | n = 74 | significantly reduced | unknown | CGI-I mostly much or very much improved | Masi et al., 201942 |
| Children with ADHD and high SOL (mean 135 min) | unknown | before bedtime | n = 24 | SOL over 1 hour shorter | unknown | Tjon Pian Gi et al, 200243 | |
| Children with ADHD-C on MPH, 7 - 12 years | 3 to 6 mg melatonin by weight vs. placebo | N = 50, n = 26 | SOL shorter (18 min vs. 23.2 min) | Sleep duration + 51 min | Sleep through reduced | Length growth and weight gain improved, appetite correlated with sleep duration, independent of melatonin | Mostafavi et al, 201244 |
| Sleep Phase Delay Syndrome (DSPD) | |||||||
| DSPS with delayed melatonin rhythm compared to bedtime | 0.5 mg immediate release | 1 hour | n = 116 | -34 min earlier (95% CI: -60 to -8) | unknown | Sleep efficiency increased; PROMIS scores improved | Sletten et al. 201845 |
| Children and young people with autism | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Children with ASA | 1 mg | Before bedtime | n = 65 | -22.0 min (p0.0001 vs. placebo -5.0 min) | unknown | unknown | Hayashi et al. 202232 |
| Children with ASA | 4 mg | Before bedtime | n = 65 | -28.0 min (p0.0001 vs. placebo -5.0 min) | unknown | unknown | Hayashi et al. 202232 |
| Children with ASA, 4-10 years | 3 mg sustained release (1 mg immediately, 2 mg within 6 hours) | 21:00 | n = 32, N = 64 | Actigraphy: -34.39 min; CSHQ-SOD: -0.83 | unknown | unknown | Cortesi et al., 201246 |
| Children and adolescents with ASA, 2-17.5 years of age | 2-5 mg sustained release, on-titration | 30-60 minutes | n = 125 | -25.3 min (95% CI: -44.7 to -5.9) | unknown | unknown | Gringras et al, 201747 |
| Children and adolescents with ASA, 3-16 years | 2 mg to max. 10 mg immediate release, titrated to “good results” | 30-40 min | N = 17 | -46.7 min | +52 min | nocturnal awakening unchanged | Wright et al, 201148 |
| Children with ASA, medium 5 yrs. | 5 mg immediate release | 20 min, 4 weeks crossover | n = 7 | Sleep latency reduced from 2.6 hrs to 1.06 hrs | Extended from 8.05 to 9.84 hours | Nocturnal awakenings reduced to 30% | Garstang & Wallis 200649 |
| Children with ASA, fragile X syndrome or both, 2-15 yrs, mean 5.5 yrs | 3 mg immediate release | 30 min before bedtime, 2 weeks crossover | n = 12 | 28 min faster, 42 min earlier | 21 min longer | Wirojanan et al., 200950 | |
| Children with ASA, 3-10 yrs | 1 (bn = 7), 3 (n = 14), 6 (n = 3) mg immediate release (dose titration) | 30 min before bedtime, 14 weeks open-label after 2 weeks placebo run-in | n = 24 | 16 min faster | 15 min longer | Improvement in sleep, behavior and parent stress scales | Malow et al, 201251 |
| Children with ASA and Asperger syndrome, 6-17 yrs (open-label, no RCT) | 3 mg immediate release | in the evening before bedtime, 14 days | n = 15 | 18 min faster | unchanged | Behavioral measures significantly improved (effect disappeared after discontinuation) | Paavonen et al., 200352 |
| Children with neurodevelopmental disabilities incl. ASD and DSPS, 2-18 yrs. | 5 mg sustained release (CR) | in the evening before bedtime, 10 days crossover, then 3 mo open-label | n = 50 | 34 min shorter | 30 min longer | Clinical and global function improved; family stress reduced | Wasdell et al., 200853 |
| Children with neurodevelopmental disorders (~60 of them with ASD), 3-15 yrs (MENDS study) | 0.5 / 2 / 6 / 12 mg immediate release (titrated) | 45 min before bedtime, 12 weeks | n = 146 | 58.3 min shorter (actigraph) | 15.7 min longer | 7.3 % fewer nights with unsatisfactory sleep | Gringras et al., 2012 (MENDS)54 |
| Children and adolescents with other disorders | |||||||
| Target group | Dose | Intake before bedtime | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Children with Rett syndrome, 10 y. | 2.5-7.5 mg immediate release | in the evening before bedtime, 4 weeks crossover | n = 9 | 19 min faster (p < 0.05) | TST +22 min (n.s.) | Wake-up unchanged | McArthur & Budden, 199855 |
| Children with Angelman syndrome with chronic insomnia, 2-15 yrs. | 2.5-5 mg immediate release | 30 min before bedtime, 4 weeks crossover | n = 8 | 32 min faster (p < 0.001) | 56 min longer (p = 0.001) | Waking up significantly reduced | Braam et al., 200856 |
| Children and adolescents with chronic (idiopathic) sleep disorders | |||||||
| Target group | Dose | Time before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Children with idiopathic CSOI, 6-12 yrs. | 5 mg immediate release | 19:00 (~ 2-3 hrs before bedtime) | n = 62 | 17 min (latency) / 57 min faster (onset) (p < 0.001) | 33 min longer | RAND-GHRI / FS-II Health & sleep status significantly improved | Smits et al., 200357 |
| Adults aged 45 and over | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Primary insomnia aged 45 to 60 years | 3 mg immediate release | 1 hour | n = 51 (melatonin group), N = 97 (total) | No significant improvement | -30.63 min earlier wake time (p=0.001) | PSQI unchanged | Xu et al. 202058 |
| Adults with insomnia aged 51 and over | 0.1 mg | 30 minutes | n = 15 | not significant | Improvement reported | Sleep efficiency: 84% (vs. 78% placebo) | Zhdanova et al. 200159 |
| Adults with insomnia aged 51 and over | 0.3 mg | 30 minutes | n = 15 | not significant | Improvement reported | Sleep efficiency: 88% (vs. 78% placebo, p0.0001) | Zhdanova et al. 200159 |
| Adults with insomnia aged 51 and over | 3 mg | 30 minutes | n = 15 | not significant | Improvement reported | Sleep efficiency: 84% (vs. 78% placebo) | Zhdanova et al. 200159 |
| Adults aged 55 and over | 2 mg sustained release | unknown | n = 170 | Patient reports, variable | +2.2 min vs. placebo | Improvement in sleep quality | Lemoine et al, 200760 |
| Adults aged 55 and over | 2 mg sustained release | 2 hours before sleep onset, after eating | n = 40 | 6.9 min / | 10.6 min faster vs. placebo | unknown | Luthringer et al, 200961 |
| Adults 55 to 80 years | 2 mg sustained release | 2 hours before sleep onset | N = 354, n = 171 | 24.3 min (3 weeks, 65-80 years); 25.9 min faster (19 weeks, 65-80 years) | unknown | Improvement in sleep quality | Wade et al, 200762 |
| Adults aged 55 and over (average 64.2 years) | 0.3 mg | 30 minutes | n = 24 | unknown | Trend towards increase (mainly during the day) | Sleep efficiency increased (mainly biological day) | Duffy et al., 202263 |
| Adults aged 56 and over (average 64.2 years) | 5 mg | 30 minutes | n = 24 | unknown | Significant increase (day and night) | Sleep efficiency significantly increased (day and night) | Duffy et al, 202263 |
| Adults with chronic insomnia, 70-90 years | 2 mg immediate release | 2 hours | n = 24 | Significant improvement after 1 week | unknown | Sleep efficiency: 78.8% (vs. 77.4% placebo) | Haimov et al., 1995 64 |
| Adults with chronic insomnia, 70-90 years | 2 mg sustained release | 2 hours | n = 24 | Significant improvement after 1 week | unknown | Sleep efficiency: 80.4% (vs. 77.4% placebo) | Haimov et al., 1995 64 |
| Adults with chronic insomnia, 70-90 years | 1 mg sustained release | 2 hours | n = 17 | Significant improvement after 2 months | unknown | Sleep efficiency: 84.3% (vs. 77.4% placebo) | Haimov et al., 1995 64 |
| Adults with primary insomnia | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Healthy middle-aged subjects | 0.3 mg immediate release | in the evening before bedtime | n = 15 (crossover) | 4.1 min faster, 5.8 min earlier | 8.4 min longer | Sleep efficiency tends to increase | Attenburow et al., 199665 |
| Healthy middle-aged subjects | 1.0 mg immediate release | in the evening before bedtime | n = 15 (crossover) | 3.6 min faster, 10.9 min earlier | 21.6 min longer (significant) | Sleep efficiency significantly increased | Attenburow et al., 199665 |
| Adults with primary insomnia, 18-80 y. | 2 mg sustained release (PRM) | 2 h before bedtime, 3 weeks + 26 weeks | n = 791 | 19.1 min faster at ≥ 55 y. | approx. 40 min longer | PSQI and WHO-5 significantly improved | Wade et al., 201066 |
| Adults with intellectual disabilities | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Adults and children with intellectual disability and chronic insomnia | 5 mg immediate release | 30 min before bedtime, 4 weeks | n = 51 | 29 min shorter, 34 min earlier (p < 0.001) | 48 min longer | 40 % less frequent waking/night | Braam et al., 200867 |
| Adults with ID and chronic insomnia (follow-up RCT on daytime behavior) | 5 mg immediate release | 30 min before bedtime, 4 weeks | N = 49, n = 27 | 40 min faster | 53 min longer | 30 % fewer night-time awakenings, challenging behavior significantly reduced during the day | Braam et al., 201068 |
| Adults and children with ID | 0.5-10 mg immediate release or sustained release | variable | 34 min faster | 50 min longer | nocturnal awakening reduced | Braam et al, 2009 (mata study, k = 9 RCTs, n = 183)69 | |
| Adults: Seniors with insomnia and dementia | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency (SOL) | Sleep duration | Sleep quality / sleep efficiency | Study |
| Elderly patients (~ 76 yrs) with insomnia and chronic diseases | 2 mg sustained release | 2 h before bedtime, 3 weeks | n = 12 (crossover) | SOL 24 min faster (not significant), WASO 49 min shorter (significant) | unchanged | Sleep efficiency and subjective sleep quality significantly improved | Garfinkel et al., 199570 |
| Patients with Alzheimer’s dementia and nocturnal sleep disturbance | 2.5 mg sustained release or 10 mg immediate release | 1 h before bedtime, 8 weeks | n = 157 (3-arm) | unchanged (actigraphic) | unchanged (actigraphic) | Trends, but no significant effects | Singer et al., 200371 |
| Patients with institutionalized Alzheimer’s dementia | 8.5 mg immediate release + 1.5 mg sustained release | 22:00, 10 days | N = 41 | unchanged (actigraphic) | unchanged (actigraphic) | nchanged (actigraphic); agitation also unchanged | Gehrman et al., 200972 |
| Patients with mild to moderate Alzheimer’s dementia, 75 yrs. | 2 mg sustained release (add-on to standard therapy) | 1-2 hrs before bedtime, 24 weeks | n = 80 | unknown | unknown | PSQI significantly improved; ADAS-Cog and IADL significantly better in Alzheimer’s with insomnia | Wade et al, 201473 |
| Adults with Parkinson’s | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Parkinson’s with sleep disturbance | 3 mg immediate release | 30 min before bedtime, 2 weeks | n = 18 | not significant (PSG) | not significant | subjective sleep quality (GSDS) improved; PSG parameters unchanged | Medeiros et al., 200774 |
| Parkinson’s with REM sleep behavior disorder | 4 mg sustained release | immediately before bedtime, 8 weeks | n = 30 | unknown | unchanged | No significant reduction in REM sleep disorder | Gilat et al., 202075 |
| Parkinson’s with sleep disturbance | 50 mg (very high dose) | 30 min before bedtime, 2 weeks | n = 40 | unknown | 5 min longer (5 mg) , 8 min longer (50 mg) | subjective sleep quality significantly improved | Dowling et al., 200576 |
| Adults: Shift workers | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Nurses on night shift, 24-46 y. | 5 mg immediate release | 30 min before daytime sleep after night shift | n = 86 (crossover) | subjective SOL significantly shortened vs. placebo and baseline | unchanged | unchanged | Sadeghniiat-Haghighi et al, 200877 |
| Shift workers with sleep onset disorder, medium ~ 36 y. | 3 mg immediate release | 30 min before daytime sleep | n = 39 (crossover) | SOL 7 min faster (actigraphy, p < 0.05), WASO not significant | TST not significant | Sleep efficiency significantly increased | Sadeghniiat-Haghighi et al., 201678 |
| Young adults (27 y.) in simulated night shift (8 h daytime sleep) | 1.8 mg sustained release | 30 min before daytime sleep | n = 21 (crossover) | unknown | Loss of daytime sleep time prevented on first day; stronger in “poor daytime sleepers” | no hangover effects; MSLT unchanged | Sharkey et al., 200179 |
| Nurses on night shift | 6 mg immediate release | 30 min before daytime sleep | n = 47 | TST significantly increased during daytime sleep | TST +94 min on some days | subjective sleep quality not significantly | source not verifiable |
| Adults: Jetlag | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Travelers after eastbound flight over 6-8 time zones | 5 mg immediate release | at bedtime at destination, 4 days | n = 234 | SOL significantly shorter (p < 0.05) | unknown | Sleep quality significantly improved. | Suhner et al, 199880 |
| Travelers after eastbound flight over 6-8 time zones | 0.5 mg immediate release | at bedtime at destination, 4 days | n = 234 | tended to be shortened (less than 5 mg) | unknown | tended to be improved (less than 5 mg) | Suhner et al., 199880 |
| Travelers after eastbound flight over 6-8 time zones | 2 mg sustained release | at bedtime at destination, 4 days | n = 234 | not significant | unknown | less effective than immediate release | Suhner et al., 199880 |
| Travelers after eastern flight (Cochrane meta-analysis) | 0.5-5 mg sustained release | near destination bedtime (10-24 pm) | 10 RCTs | Jet lag symptoms significantly reduced in 9/10 studies | not systematically evaluated | Sleep quality significantly better at 5 mg vs. 0.5 mg; higher doses not helpful; sustained release melatonin had worse effect | Herxheimer & Petrie 2002 (Cochrane)81 |
| Insomnia with comorbidities | |||||||
| Target group | Dose | Intake before sleep | Number of subjects | Sleep onset latency | Sleep duration | Sleep quality / sleep efficiency | Study |
| Internal medicine inpatients with difficulty falling asleep | Mean stable dose 5.4 mg immediate release (flexible) | In the evening before bedtime, 8-16 days | N = 33, n = 18 | Significantly accelerated sleep onset (p < 0.05) | Sleep duration significantly increased | Sleep quality and depth significantly improved; no hangover | Andrade et al., 200182 |
| Ventilated intensive care patients after tracheostomy | 10 mg | 21:00, 4 nights | n = 24 | unknown | 60 min longer | Sleep efficiency tends to be better; lower doses (1-2 mgI) may be better | Bourne et al., 200883 |
| Hemodialysis patients with insomnia | 3 mg immediate release | at bedtime = 22:00, 6 weeks | n = 50 (crossover) | SOL 21 min faster (actigraphy) | 1 h longer (p < 0.01) | Sleep efficiency significantly increased | Edalat-Nejad et al., 201384 |
| Patients with chronic obstructive pulmonary disease (COPD) | 3 mg immediate release | 22:00, 3 months | n = 25, n = 12 | shortened (p = 0.008) | extended (p = 0.046) | PSQI total score and sleep disturbance subscale significantly improved | Nunes et al., 200885 |
| Breast cancer patients with insomnia (30-75 yrs) | 6 mg immediate release | 30 min before bedtime, 8 weeks | n = 43 | unknown | 37 min longer | PSQI total score and subscales (sleep disturbance, sleep quality, sleep duration) significantly improved | Hansen et al., 201486 |
2.2. Melatonin 7 hours before sleep: sleep phase is shifted forward
The circadian rhythm can be shifted forward or backward by administering melatonin at appropriate times.87 The so-called phase-advance zone for melatonin, in which it shifts the circadian rhythm forward, is the period in the afternoon or early evening. This can help to treat delayed sleep phases, such as delayed sleep phase syndrome (DSPS, also known as DSWPD or ZSPS), which is common in ADHD, or jet lag to the east.88 The phase-advance zone for melatonin comprises CT 6 to CT 18, the phase-delay zone CT 18 to CT 6.89
Delayed melatonin secretion is thought to play a key role in the pathophysiology of DSPS.
Delayed Sleep Phase Syndrome (DSPS) must be diagnosed,
- when
- Problems falling asleep at the desired bedtime after 11:30 p.m. and/or
- Sleep onset latency of more than 30 minutes
- lead to daytime impairments of social and/or occupational functioning, and
- Symptoms
- have existed for at least 6 months
- cannot be explained by other factors
2.2. Melatonin according to DLMO: sleep phase shifted backwards
Taking melatonin in the middle of the night or directly after waking up can shift the circadian melatonin rhythm backwards.
3. Miscellaneous about melatonin
The daily doses of melatonin as a medication range from 0.5 milligrams to 8 milligrams.
Sustained release melatonin should only be used in the event of complete failure of melatonin production90
3.1. Synthesis of melatonin
Melatonin is formed in the pinealocytes of the pineal gland from L-tryptophan via the intermediate stages 5-hydroxytryptophan and serotonin. The last two steps (N-acetylation by AANAT, methylation by ASMT/HIOMT) are regulated night-specifically.
L-tryptophan → 5-HTP (through tryptophan hydroxylase) → serotonin (through AADC) → N-acetylserotonin (through AANAT) → melatonin (through HIOMT/ASMT).
Brightness is registered by retinal ganglion cells containing melanopsin and suppresses melatonin synthesis in the pineal gland via the suprachiasmatic nucleus (SCN).
This inhibition ceases in darkness. Then the SCN activates noradrenergic fibers to the pineal gland via the paraventricular nucleus, the spinal intermediolateral column and the cervical ganglion superius, which induces AANAT and increases melatonin release.
3.2. What is influenced by melatonin
Melatonin stabilizes and strengthens the coupling of circadian rhythms, especially core temperature and the sleep-wake rhythm.
Melatonin also appears to influence the circadian organization of several other physiological functions, such as91
- antioxidant defense
- Hemostasis
- Glucose regulation
- Immune defense
- Dexamethasone induces circadian gene expression in cultured fibroblasts and transiently shifts phasing in liver, kidney and heart, but not in SCN94
- Core body temperature
- Melatonin peak in normal state is approx. 1.8 ± 0.2 h before the temperature minimum95
- Melatonin rhythm is less easily influenced by environmental factors (apart from light) than body temperature. Melatonin therefore a more reliable marker for the circadian phase than core body temperature9697
- the temporal course of the drop in core body temperature is closely linked to nocturnal melatonin secretion (r = 0.97). Melatonin is causally responsible for at least 40 % of the amplitude of the temperature rhythm.
Suppression of melatonin secretion with the β-blocker atenolol attenuated the nocturnal drop in temperature. Melatonin administration lowered the temperature during the day.98 - The DLMO occurs approximately 7 hours before the body core temperature minimum and 1.25 hours before the end of melatonin synthesis.99100
3.3. Degradation of melatonin
Due to the degradation of melatonin via CYP1A2 and (to a lesser extent) CYP2C19, increased caution should be exercised when combining melatonin with drugs that are also degraded via these pathways.
This mechanism also explains the fatigue-promoting effect of imipramine/desipramine, which, if severe, means that imipramine should be taken in the evening.
A decrease in the effect of melatonin could be due to CYP1A2 underactivity. In this case, a reduction in dosage is recommended.101
3.4. Measurement of melatonin
Melatonin is released from the time it gets dark, whereby the release initially increases slowly and usually more quickly between 10 and 11 p.m. (acrophase). The high melatonin level drops again from around 2 am to 4 am.90
A measurement can be made using serum, the first morning urine or saliva.
A measurement based on the serum or the first morning urine is not suitable for determining the daily profile.
3.5. Risks and side effects of melatonin
Melatonin appears to be a safe remedy for improving sleep problems in children and adults with ADHD. The large amount of use, the long duration of use in the respective persons with ADHD and the increasing numbers of use indicate evidence for successful use. The fact that there are only a few large clinical studies on the use of melatonin for sleep problems in ADHD is probably also due to the fact that off-patent active ingredients (such as melatonin) are understandably not of commercial interest to pharmaceutical companies. It is not the task of pharmaceutical companies to investigate the efficacy or safety of off-patent active ingredients. On the contrary, there would be more of an economic interest in identifying negative aspects of melatonin in order to avoid competition from melatonin as an active ingredient in the public domain. However, such reports are also lacking.
We could not find any studies documenting the occurrence of relevant side effects of melatonin. In view of the high number of users and the long history of use for the treatment of sleep problems, including in children and adults with ADHD, we consider the absence of reports of side effects to be an indication of good tolerability.
Nevertheless, there are reports of side effects of melatonin when taken continuously. In these cases, intermittent use is probably recommended, with a 1 to 2 day break every 1 to 2 weeks.
A review states that no relevant side effects of melatonin are known.101
Adults produce approximately 20 to 60 micrograms of melatonin daily. Melatonin is rapidly absorbed and metabolized on the first pass through the liver, with a half-life of 30 to 40 minutes (in 3- to 8-year-old children as well as adults, while newborns showed a half-life of up to 20 hours) and a bioavailability of 1 to 37%. In the liver, it is metabolized by CYP1A220 to 6-hydroxymelatonin and then sulfated to 6-sulfatoxymelatonin or conjugated to glucuronide and excreted.102
Too high a melatonin level can cause depression (winter depression).
Possible side effects can be
- Night sweats103
- Hot flushes at night103
- Mood changes103
- Restlessness
- Nervousness
- Fear
- Lethargy
- Nightmares
- Occasionally (in 1 in 100-1,000 people treated) to rarely (in 1 in 1,000-10,000 people treated)104
- Very vivid dreams
- Occasionally to rarely104
- Stomach cramps
- Occasionally to rarely104
- Dizziness
- Occasionally to rarely104
- Headache
- Occasionally to rarely104
- Irritability
- Occasionally to rarely104
- Reduced sexual desire
- Occasionally to rarely104
3.6. Interactions with melatonin
Interactions with antithrombotic and antiepileptic drugs are possible.
3.6.1. Reducing the effect of melatonin
- Some psychotropic drugs90
- Alpha blocker90
- Beta blockers90
- Alcohol
- Even moderate doses of alcohol, one hour before bedtime, caused a significant reduction in melatonin levels in young adults.105
3.6.2. Increasing the effect of melatonin
Due to the degradation mechanism, inhibitors of CYP1A2 and CYP2C19 increase the plasma levels and bioavailability of melatonin:
- Fluvoxamine106107
- Inhibits the breakdown of melatonin in the liver; increases the duration and effectiveness of melatonin90
- Desipramine106
- Consequently also imipramine, as this is converted to desipramine
- Caffeine108
- Theophylline102
- Citalopram / escitalopram as a CYP2C19 inhibitor109
- Ciprofloxacin
- Inhibits the breakdown of melatonin in the liver; increases the duration and effectiveness of melatonin90
3.6.3. Melatonin increases the effect of other medications
Melatonin enhances the dampening effect of, among other things:90
- Benzodiazepines
- Zaleplon
- Zopiclone
- Zolpidem
- Imipramine
- Thioridazine
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