Melatonin for Sleep Issues
Hormone released by the pineal gland in response to darkness that signals circadian phase to the brain's suprachiasmatic nucleus; low-dose supplementation can shorten time to fall asleep and ease jet lag.
Melatonin for Sleep Issues
4 of 4 results reported a benefit, from 2 published studies.
2 studies, including a review of trials · the chart counts everything measured
- 4 reported a benefit
Colour keyReported a benefitNo clear benefitUnclearPossible harmAmber is for highlights, such as where the most research is. It never means a result was good.
- Total sleep timeLarge effectmuch better than the comparison group1 review of trials2020 study ↗
- Overall sleepReported a benefitmeasurement not reportedLimited studies suggested improvements in sleep conditions compared to no melatonin over 2 weeks to 12 months.1 review of trials2023 study ↗
Also measured in these studies (2)
These were measured alongside, but they are not what this condition is about.
- Overall thinking skillsReported a benefitmeasurement not reportedLimited studies suggested improvements in cognitive outcomes compared to no melatonin over 2 weeks to 12 months.1 review of trials2023 study ↗
- Tiredness (fatigue)Reported a benefitmeasurement not reportedLimited studies suggested improvements in fatigue compared to no melatonin over 2 weeks to 12 months.1 review of trials2023 study ↗
Side effects: measured in 1 result. No result reported more side effects than the comparison group.
These are the figures the studies reported, not a prediction for any one person. Where several studies measured the same thing in the same unit, we show a simple average and say so. Every result is listed below.
See every resultThe connection
Difficulty falling asleep, staying asleep, or poor sleep quality. Insomnia affects ~30% of adults.
Also known as: N-acetyl-5-methoxytryptamine
Melatonin × Sleep Issues: at a glance
Every published result for this pair, extracted and audited.
These charts count reported findings from published studies, grouped by reported benefit and study design. Study design is not a certainty grade.
Melatonin / Sleep Issues: reported findings; one study may contribute several findings.
What the evidence shows
What this means: Counts describe research quantity, not treatment effectiveness or certainty.
| Category | Findings (count) |
|---|---|
| Benefit | 4 |
| No benefit | 1 |
Study designs behind these findings
What this means: Counts describe research quantity, not treatment effectiveness or certainty.
| Category | Findings (count) |
|---|---|
| Meta-analysis | 1 |
| Systematic review | 4 |
- Studies
- 2
| Study | Outcome | Reported result | Uncertainty (as reported) | Study duration |
|---|---|---|---|---|
| Sleep Disorders in Children and Adolescents with Autism Spectrum Disorder: Diagnosis, Epidemiology, and Management. (PMID 32112261) | sleep duration | 44 min | Hedge's g 1.07 [95% CI 0.49-1.65] | Not reported |
| Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic review. (PMID 37429996) | cognitive outcomes | Not reported | Not reported | 2 weeks and 12 months |
| Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic review. (PMID 37429996) | fatigue | Not reported | Not reported | 2 weeks and 12 months |
| Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic review. (PMID 37429996) | safety | Not reported | Not reported | 2 weeks and 12 months |
| Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic review. (PMID 37429996) | sleep conditions | Not reported | Not reported | 2 weeks and 12 months |
Study results, as reported by the publications
Every measured outcome, one row per finding - numbers exactly as reported. Units are preserved where supplied; missing units are not inferred.
| Study and type | Reported sample and duration | Outcome measured | Reported result | What studies found |
|---|---|---|---|---|
| PMID 37429996 2023 Systematic review | Sample (as reported): Not reportedDuration: 2 weeks and 12 months | cognitive outcomes | Not reported | Benefit |
| PMID 37429996 2023 Systematic review | Sample (as reported): Not reportedDuration: 2 weeks and 12 months | fatigue | Not reported | Benefit |
| PMID 37429996 2023 Systematic review | Sample (as reported): Not reportedDuration: 2 weeks and 12 months | safety | Not reported | No benefit |
| PMID 37429996 2023 Systematic review | Sample (as reported): Not reportedDuration: 2 weeks and 12 months | sleep conditions | Not reported | Benefit |
| PMID 32112261 2020 Meta-analysis | Sample (as reported): Not reportedDuration: Not reported | sleep duration | 44 min (Hedge's g 1.07 [95% CI 0.49-1.65]) | Benefit |
Melatonin × Sleep Issues: the evidence base
Hand-selected PubMed studies, linked to the originals.
Ordered by strength of evidence, then result direction.
01The effects of oral cannabidiol supplementation on blood pressure in adults: a systematic review of randomised controlled trialsRoberts A, et al. · Journal of cannabis research · 2026PMID 42321899 ↗02Dysregulation of melatonin rhythm in Parkinson's and Huntington's disease: a systematic review and meta-analysisSuram RP, et al. · Frontiers in aging neuroscience · 2025PMID 41143249 ↗03Effects of Dietary Supplementation in Patients with Restless Legs Syndrome: A Systematic ReviewGonzález-Parejo P, et al. · Nutrients · 2024PMID 39064758 ↗04Sleep disturbances and female infertility: a systematic reviewLi J, et al. · BMC women's health · 2024PMID 39707272 ↗05The Role of Magnesium in Sleep Health: a Systematic Review of Available LiteratureArab A, et al. · Biological trace element research · 2023PMID 35184264 ↗06Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic reviewMorsali S, et al. · Inflammopharmacology · 2023PMID 37429996 ↗Community experiences
Contributors volunteered; this does not establish treatment effectiveness or population incidence.
Reported changes
No publishable community breakdown is available. This does not establish that no reports exist.