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Melatonin for jet lag: when to take it, how much

Timing matters more than the milligrams. Take it at your new bedtime, after you land, not whenever you feel tired.

The short answer

Melatonin can help your sleep catch up with a new time zone, and the research is fairly consistent about how. In the trials pooled by a Cochrane review, travelers took 0.5mg to 5mg close to their target bedtime at the destination, roughly 10pm to midnight local time, for two to five nights after arriving. On flights across five or more time zones, they reported less jet lag than with a placebo. Starting before departure added nothing, and taking it earlier in the day may make jet lag worse.

Why jet lag happens

Your body clock keeps running on home time after you land. Light and darkness are its main cues, and melatonin is the nighttime signal it sends when the light fades. Cross at least two time zones and the clock and the local day disagree: trouble sleeping at night, sleepiness during the day, foggy thinking, sometimes an unsettled stomach, usually starting within a day or two of arriving.

The clock does catch up, just slowly. The CDC puts the average at about one hour a day after flying east and about an hour and a half a day after flying west. A six-hour eastbound trip can take most of a week to settle on its own.

Why flying east is harder

For most people the body’s internal day runs a little longer than 24 hours, so stretching the day (flying west) comes easier than shortening it (flying east). The melatonin research follows the same pattern: the benefit was larger the more time zones people crossed, and smaller on westward flights.

When to take it

  • After you land, at your new bedtime.Take it as part of your wind-down at local bedtime for the first two to five nights. For eastward trips, the CDC’s guidance puts it about 90 minutes before you plan to sleep.
  • Not before you leave. In the trials, starting before departure added nothing.
  • Not earlier in the day. Taking melatonin in the afternoon to get through a slump may make jet lag worse, so save it for bedtime.
  • With a full night ahead. Leave seven hours or more before you need to be up, and never take it before driving, including the drive home from the airport.

The everyday wind-down habits still apply on the road; they’re covered in how long does melatonin take to work.

How much

The Cochrane review found doses between 0.5mg and 5mg similarly effective for jet lag overall, with one difference: people fell asleep faster and slept better on 5mg than on 0.5mg. Doses above 5mg worked no better. A 2mg slow-release form did relatively poorly, which the authors read as a sign that a short, higher peak works better than a slow trickle.

The CDC adds that 0.5mg to 1mg is often enough to shift the body clock itself. So a lower dose may be all the clock needs, while the research favored 5mg for falling asleep on those first nights. Oprimaze Sleep Support carries 5mg: the top of the studied range, not beyond it.

Get the light right too

Light is the body clock’s strongest cue, and its timing matters alongside melatonin’s. Per the CDC, morning light helps you adjust after flying east, and evening light helps after flying west. After an eastbound flight, get outside early and keep the evening dim; after a westbound one, stay out in the late-day light. On very long trips the best hours shift with the number of time zones, and a jet lag planner can work them out for your route.

Short trip? Stay on home time

If you’ll be away for less than two days, the CDC suggests not adapting at all: keep your sleep, meals and activity on home time. Shifting your clock for a day or two only means shifting it back when you get home.

On the plane

Drink water, go easy on alcohol, and avoid long-acting sleeping pills, which the CDC flags for flights. A strip needs no water and no room in your liquids bag, so it can ride in a carry-on and be ready for the first night at your destination. More in how to sleep on a plane.

Who should check with a doctor first

Short-term melatonin use appears safe for most adults, according to the NIH’s National Center for Complementary and Integrative Health, though it can cause headache, dizziness, nausea and sleepiness. Talk to your healthcare provider first if you are pregnant or nursing, have epilepsy, take a blood thinner such as warfarin, or take other regular medication. Our strips are for adults 18 and over. Melatonin may cause drowsiness, so don’t drive or operate machinery after taking it.

One more reason to choose carefully: melatonin is sold as a supplement, not a drug, and independent tests have found products whose actual content differs from the label. You can see exactly what our batch certificates of analysis cover on our quality page.

A simple plan

  • Away less than two days: stay on home time.
  • Flying east across five or more time zones: one strip at your new bedtime for the first two to five nights, morning light, dim evenings.
  • Flying west: melatonin helps less here. Lean on late-day light, and use a strip at bedtime if the first nights are rough.
  • Every time: a full night ahead, and no driving after.

Oprimaze Sleep Support strips pair 5mg melatonin with 5mg magnesium. Each Travel 4-Pack holds four individually sealed strips, enough for the first four nights of a trip.

Sources

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.