By Paul Muchowski, Ph.D., Founder and CEO, Defined Sleep
GQ asked me a simple question: how long before bed should you take melatonin? My answer was that melatonin is not a sleep aid in the way most people use it.
Melatonin is a hormone the brain produces in response to darkness. Its job is to signal evening to the body: not to deepen sleep, not to keep you asleep, and not to improve the architecture of your night. When the Agency for Healthcare Research and Quality reviewed the evidence, it found that exogenous melatonin produces only modest reductions in the time it takes to fall asleep, with the strongest signal in delayed sleep phase and circadian disorders rather than general insomnia.
What melatonin does well is shift circadian timing, which is genuinely useful for jet lag and for shifting bedtime earlier. What it does not do is increase the proportion of the night you spend in deep slow-wave or REM sleep, the two stages most associated with waking up restored.
This is the gap I built Defined Sleep to close. Our FDA-registered, double-blind, placebo-controlled, randomized crossover Phase 2 trial, published in the Journal of Clinical Sleep Medicine and registered at ClinicalTrials.gov (NCT05233761), measured what most sleep supplements do not: time spent in deep and REM sleep, tracked nightly by validated wrist-worn actigraphy. Among participants with the lowest baseline restorative sleep, the formulation produced as much as 2X more deep and REM sleep per night.
Melatonin can tell your body it is bedtime. That is not the same as helping you sleep.
FAQs
1. Is melatonin a sleep aid or a hormone?
Melatonin is a hormone that regulates your sleep-wake cycle, not a traditional sedative sleep aid.
2. Why do people think melatonin helps with sleep?
Because it signals the body that it’s time to sleep, many people assume it directly causes sleep, which isn’t entirely accurate.
3. When is melatonin actually useful?
Melatonin is most effective for jet lag, shift work, or circadian rhythm disorders.
4. Can melatonin make you fall asleep faster?
It may help some people fall asleep sooner, but it doesn’t work like sleeping pills.
5. Are there side effects of melatonin?
Possible side effects include dizziness, headaches, nausea, and daytime drowsiness.