Don’t count on melatonin to cure long-term insomnia; on average it only helps people fall asleep about 7 minutes sooner — start with cognitive behavioural therapy for insomnia

People who sleep poorly and take melatonin fall asleep about 7 minutes sooner on average than on placebo, and sleep about 8 minutes more. The American Academy of Sleep Medicine does not recommend it for chronic insomnia. In China it is sold as a health food; the label says “this product cannot replace drugs.” Crossing 5 or more time zones by air for jet lag, it can ease jet-lag symptoms.

Cost

No money, and you also save long-term melatonin purchases. The hard part is that it is easy to buy over the counter; one tablet is far less trouble than weeks of hospital treatment.

Benefit

First how large the effect is. A 2013 meta-analysis pooled 19 trials and 1683 people. Each trial was randomized versus placebo. Sleep problems were not caused by another disease; 14 of the trials studied insomnia. Melatonin shortened time to sleep onset by a mean 7.06 minutes (95% CI 4.37–9.75, credible range). Total sleep time rose 8.25 minutes (1.74–14.75). Sleep-quality improvement was also small (SMD 0.22, 0.12–0.32). The authors themselves note this shortens onset less than other sleep drugs. Next guidelines. The American Academy of Sleep Medicine’s 2017 chronic-insomnia medication guideline advises clinicians not to use melatonin for hard-to-fall-asleep or restless sleep; recommendation strength “weak.” Basis: 3 trials, all using 2 mg sustained-release melatonin, all subjects aged 55 and above. Evidence quality “very low.” The only poolable outcome was sleep quality (SMD 0.21, −0.36 to 0.77), short of clinical meaning. Domestic melatonin health foods list the function as “helps improve sleep.” Precautions say “this product cannot replace drugs”; unsuitable groups are children and adolescents, pregnant women, and nursing mothers. A 2026 Beijing market-regulation science piece also says it is “by no means a ‘wonder drug’.” Jet lag is separate. A Cochrane systematic review included 10 trials; 9 of them shared one finding. After flying across 5 or more time zones, melatonin at local bedtime eases jet lag. Daily 0.5 to 5 mg works about the same. It looks worthwhile because it is a hormone the body already makes, sounds mild, and needs no prescription.

Notes

Controversy: the meta-analysis authors think melatonin’s side effects are relatively small and the effect does not weaken with longer use, so it may still have a place in insomnia care. The Beijing market-regulation piece says it suits easing onset difficulty in middle-aged and older people from low melatonin secretion. But those 3 American Academy of Sleep Medicine trials were exactly in people 55 and above, and the conclusion is still not enough effect. There is some benefit; it is just too small to call a cure. For long-term insomnia start with cognitive behavioural therapy — Section 3, Item 26 (CBT for insomnia). Snoring, pauses in breathing in sleep, heavy daytime sleepiness: check for sleep apnea first — Section 3, Item 27 (sleep study for apnea). The label also says people who drive or operate machinery should not take it before or during work. Melatonin for children is not counted in this item; domestic labels say children and adolescents are unsuitable. Benefit set to small by judgment: no official figure for a year’s melatonin spend. The beneficiary is you.

Sources · 5

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2. Sateia MJ, Buysse DJ, Krystal AD, Neubauer DN, Heald JL (2017). Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline. Journal of Clinical Sleep Medicine, 13(2):307-349（Recommendation 12）. doi.org/10.5664/jcsm.6470
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