The Melatonin Guide
With melatonin, the hour matters more than the milligrams. It's the signal your brain sends when it gets dark, so a small dose a few hours before bed does more than a 5 or 10 mg gummy at lights out, which buys a few minutes and can still be in your blood when the alarm goes off. Take it earlier, take less, keep the lights low, and keep it only if two weeks of your own nights show it working.
Updated November 15, 2026. 12 guide pages, 34 questions, 9 myths, from 64 published sources.
Earlier.To fall asleep faster, take it 1 to 3 hours before bed. To move your bedtime earlier, take 0.5 mg about 5 hours before your usual bedtime.
Smaller.Start at 0.5 to 1 mg. 3 mg is plenty for most people, and 5 mg is the top.
Darker.Lamps only after you take it, then two weeks of your own nights to see if it works.
When should I take melatonin?
Take 0.5 to 1 mg8:30 to 10:30pmasleep by 11:30pm
What should it do?
Your own melatonin probably starts around 9:35pm.
To fall asleep faster by 11:30pm, take 0.5 to 1 mg between 8:30 and 10:30pm. 3 mg is plenty for most people, and 5 mg is the top.
- Lamps only from your window to bed, and no overhead lights.
The full window, with your night curve and the tables.
Three places to start
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If you want to and can Make more of your own Daylight soon after you wake, lamps in the evening, a dark bedroom and one wake time. Free, and it works at any age. How to increase melatonin naturally -
Flying 5 or more time zones Get over jet lag 0.5 to 5 mg at bedtime in the new time zone for the first 4 nights, and daylight at the right hours. Light alone does a lot of it. Plan your trip, a card a day -
Working nights Sleep after a night shift One day-sleep block at the same hours, dark glasses home and a dark room. A dose of 0.5 to 1 mg adds about 24 minutes. Plan your day sleep
Why are you taking it?
The right hour and dose depend on the reason, and for a few reasons the right dose is none. Pick yours.
- I'd rather not take a pillHow to help your body make more of its own, if you want to and can.
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I'm choosing a bottleWhy a gummy's label is a rough guide, and what to buy instead. -
I'm worried about side effectsWhat 37 trials found, and what nobody has tested yet. -
My child won't sleepWhat pediatricians say to try first. No dose here. - I take 5 or 10 mgHow far past your own night a big dose goes, and how long it stays.
- I can't fall asleepThe hour to take it for that job, and how many minutes it buys.
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I wake up groggyUsually too much, too late. The fix is in the curve. -
I have a drink most eveningsWhat a drink does to your own melatonin, and why to skip the tablet. -
I'm a night owlMove your bedtime earlier with a small dose late in the day and morning light. -
I'm flying across time zonesWhen to take it, and when to find or dodge daylight, day by day. -
I take it every nightWhat years of nightly use look like, and how to test if you still need it. -
I saw the heart headlineAn unreviewed 2025 abstract, and the 2026 study that found no link. -
I wake at 3amWhen a middle-of-the-night dose still clears by your alarm. -
I work nightsOne day-sleep block, dark glasses home, and where a dose fits. -
I'm over 60Why a smaller dose suits an older body better. -
My teenager is up past midnightA teen's clock runs late. What moves it back. No dose here. -
Worry keeps me awakeWhere melatonin calmed nerves in trials, and where it didn't. -
I'm pregnant or breastfeedingNot enough research on safety, so it's a question for your doctor. -
I take a daily prescriptionThe medicines it interacts with. Ask your prescriber first.
How to take melatonin, and why the hour matters more than the milligrams ยท Every study and tip, in one list
The questions people ask
When to take it
Can I take melatonin in the middle of the night?Only a small dose, with 5 or more hours left in bed. On our model a 3 mg tablet at 3am stays above your own night peak until about 6:40 to 8:40am.
How long before bed should I take melatonin?One to three hours, not at lights out. In a 2024 analysis of 26 trials, earlier doses did better, and the authors suggested about 3 hours before bed.
How long does it take for melatonin to work?A tablet peaks in your blood about 40 minutes after you swallow it, which is why the window to take it starts 1 to 3 hours before bed.- How long does melatonin last?Half is gone about an hour after the peak, so 0.5 mg at 10:30pm is back to a normal night level by about midnight. A 10 mg tablet can stay above it until near morning.
- When should I take melatonin?It depends on the job. To fall asleep faster, take it 1 to 3 hours before bed. To move your bedtime earlier, take 0.5 mg about 5 hours before your usual bedtime.
Is your coffee keeping you up?Answered on caffeine.guide
How much
- How much melatonin is too much?Trials up to 12 mg found mostly mild side effects, and nothing extra above 5 mg for jet lag. If a child swallowed some, call Poison Control at 1-800-222-1222.
How much melatonin should I take?Start at 0.5 to 1 mg. 3 mg is plenty for most people and 5 mg is the top, since jet lag trials found nothing more above it and 0.5 mg moved the clock as far as 3 mg.
How much melatonin should older adults take?Lower is better. In adults over 50, 0.3 mg restored sleep while 3 mg lingered into daylight, and melatonin may stay active longer with age. Start at 0.3 to 0.5 mg.- Is 10 mg of melatonin too much?For almost everyone, yes. It's about 33 times the 0.3 mg that restored sleep in adults over 50, and jet lag trials found nothing extra above 5 mg.
- Is 3 mg of melatonin too much?Not too much, but often more than you need. In adults over 50, 3 mg helped sleep but stayed in the blood into daylight, while 0.3 mg also worked.
- Is 5 mg of melatonin too much?It's the top of the useful range. Jet lag trials found nothing more above 5 mg, and a 5 mg gummy may hold anywhere from 3.7 to 17 mg.
What's in the bottle
Are melatonin gummies accurate?Mostly not. In a 2023 lab test of 25 US gummies, 22 missed their label, from 74 to 347 percent, and one had no melatonin at all.- Is melatonin FDA approved?No. In the US it's sold as a dietary supplement, and the FDA doesn't approve supplements or their labels before they go on sale.
Should I take extended-release or regular melatonin?Regular helps you fall asleep, and extended-release spreads the dose to help you stay asleep. In older adults with insomnia, that's what each one did.
What does melatonin do?It tells your body clock it's night. A tablet makes you a little sleepy and moves your clock earlier or later, depending on the hour you take it.
Is it safe
Can you take melatonin every night?Short courses look low-risk in trials, and the effect didn't fade with use. Years of nightly use haven't been well studied, so check that you still need it.- Can you take melatonin with alcohol?It won't undo the drink. A moderate evening drink cut people's own melatonin by about a fifth, and both make you drowsy, so skip the tablet on drinking nights.
Does melatonin cause vivid dreams?People report it, but trials haven't pinned it down. Nightmares turned up only rarely across 37 trials. If it happens to you, try a smaller, earlier dose.- Does melatonin help with anxiety?Before surgery, yes. In trials it eased nerves more than a placebo did, and in two it matched a standard sedative. For worry that keeps you up at night, they say little.
Does melatonin interact with medications?With some. Fluvoxamine made melatonin levels 17 times higher, and melatonin raised blood pressure about 6.5 points in people on nifedipine. Ask your prescriber first.
Is melatonin addictive?There's no sign of it. The effect didn't wear off in trials, and people's own melatonin came back at the same height after a week of taking it.- Does alcohol lower HRV?Answered on hrv.guide
Children and pregnancy
Can I take melatonin while pregnant?Ask your doctor or midwife first. There isn't enough research on melatonin's safety in pregnancy or while breastfeeding, so any dose is their call.- Is melatonin safe for kids?Talk to your child's doctor first. Pediatricians say sleep habits come first, there are no set dosing guidelines for children, and gummies vary a lot.
- My child ate melatonin gummies. What should I do?Call Poison Control now at 1-800-222-1222. Most children who swallow melatonin have no symptoms. Call 911 if they can't be woken or have trouble breathing.
Should my teenager take melatonin?Ask their doctor first, since there are no set melatonin doses for teens. A teen's body clock runs late, so one wake time and morning light come first.
Trips, shifts and late nights
Can you take melatonin during the day?Mostly no. In the day it makes you drowsy, and in the morning it can push your clock later. The exceptions are a late-afternoon dose and sleep after a night shift.
Does melatonin help with jet lag?Yes, after 5 or more time zones. Take 0.5 to 5 mg at bedtime in the new time zone for the first few nights, starting low, and time your daylight too.
Does melatonin help you sleep after a night shift?A little. In trials it added about 24 minutes of daytime sleep, on low-quality evidence, and didn't help people fall asleep faster. A dark room does more.
How do I fix my sleep schedule with melatonin?Take 0.5 mg about 5 hours before your usual bedtime, keep one wake time and get morning light. Then move bedtime and dose earlier a little every few days.
Why isn't melatonin working for me?Usually it's the hour, the light or the job. Taken at lights out in a bright room, the average effect is a few minutes, about 7 minutes faster to fall asleep.
Myth or fact?
Not the way you think Is melatonin a sleeping pill?
Sort of Does a bigger dose of melatonin work better?
No Should you take melatonin right at bedtime?
No Does a gummy's label tell you how much melatonin you're taking?
No Does taking melatonin make your body stop making its own?
Not shown Does melatonin cause heart failure?
Quick calculators
The melatonin window
Your wake time on a free day and your job in: when your own melatonin starts, and the hour and dose to take it.
Your dose across the night
Guess first, then watch your dose against your own night: when it falls back under it, and what's left at your alarm.
The jet lag planner
Two cities and a date in: a card a day with when to take it, when to wear dark glasses and when to get outside.
The night shift planner
Your shift in: one day-sleep block, the light to dodge on the way home, and where melatonin fits.
Does it work for you?
Fourteen nights on and off it: whether your melatonin nights beat your normal night-to-night swing.
The guide
Everything you need to know
How to take melatonin: the hour matters more than the milligrams
How to take melatonin: it tells your body what time it is, so the hour matters more than the milligrams. Take it earlier, take less, keep the room dim, and test it.
How to increase melatonin naturally
What is melatonin?
When does your body start making melatonin?
Melatonin timing: why the hour changes the direction- Melatonin dosage: why less is often enough
How long melatonin stays in your system- Melatonin and light: what lamps, screens and daylight do
What's really in a bottle of melatonin
Melatonin for jet lag and night shifts
With Gyroscope One, snap the bottle when you take it and see your melatonin nights against your usual sleep, from your Apple Watch, Oura, WHOOP or Garmin. Open Gyroscope
