Jet lag is the one travel problem you can’t pack your way out of. Your body runs an internal clock, the flight moves the outside clock faster than the inside one can follow, and for a few days the two disagree — that’s the fog, the 3 a.m. wide-awakeness, the dinner-time collapse. The internet sells a hundred cures. The research supports very few of them. Here’s the honest short list.
The one lever that actually moves the clock: light
Your internal clock resets primarily on light. Bright light at the right time nudges your rhythm toward the new time zone; the same light at the wrong time pushes it the other way — sleep researchers are unusually blunt that badly-timed light can make jet lag worse, not better. The working rule most guidance converges on: after flying east (say, to Japan), seek morning light and go easy on late-evening brightness; after flying west, evening light is your friend. For big jumps, the ideal timing shifts day by day — a jet-lag calculator app can do that arithmetic — but even the crude version (“east: mornings outside”) beats improvising.
The supporting cast
Melatonin is the second tool with real evidence behind it — reviews consistently find it can reduce jet lag when taken at the right point in the evening at the destination, and its effect adds to light’s rather than replacing it. It’s still a supplement that isn’t right for everyone, so treat it as a pharmacist conversation, not a candy purchase. Beyond that, the boring things carry real weight: start shifting sleep by an hour or two in the days before a big eastward trip, drink water on the plane, keep alcohol modest, and on arrival, eat meals on the destination’s schedule — meals are a smaller clock signal, but a signal.
What the evidence doesn’t support
Pressure-point wristbands for jet lag, aromatherapy, and the assorted folklore that circulates every summer: reviewers who have gone looking for evidence largely come back empty-handed. None of it is likely to hurt you, but none of it is moving your circadian clock either. The same goes for the hope that one heroic first-day nap fixes everything — a short 20-minute nap can rescue an afternoon, but a long one usually just anchors your clock to the old time zone.
A realistic timeline
The commonly cited rule of thumb is that adjustment takes roughly a day per time zone crossed, faster westward than eastward. You can shorten that meaningfully with well-timed light and evening melatonin; you can’t erase it. Build a gentle first day into any big-jump itinerary — a walk in daylight, an early dinner, no hero plans — and you’ll be surprised how much of the trip that one soft day buys back.
If the trip in question is your first long-haul, our first international trip checklist covers the rest of the pre-flight calm, and the sleep-kit basics — a proper mask and earplugs — live in our gear directory. This piece is general information rather than medical advice; anyone with a health condition or medication schedule should have the melatonin conversation with a professional first.
Frequently asked questions
What actually helps jet lag the most?
Correctly timed light exposure. Bright light at the right time of day shifts your body clock toward the destination; the same light at the wrong time shifts it away. After flying east, favor morning light; after flying west, evening light.
Does melatonin work for jet lag?
Reviews consistently find it can help when taken at the right time in the evening at your destination, and its effect adds to well-timed light. It isn't right for everyone — treat it as a pharmacist conversation before a purchase.
How long does jet lag last?
The common rule of thumb is roughly a day of adjustment per time zone crossed, with eastward travel taking longer than westward. Timed light and melatonin can shorten it; nothing reliably eliminates it.
Do jet lag wristbands or pressure points work?
Researchers who have looked for evidence behind pressure points, aromatherapy and similar folk remedies have largely come back empty-handed. They're unlikely to harm, but they aren't moving your body clock.
Should I nap on arrival?
A short nap of about 20 minutes can rescue an afternoon. Long naps tend to anchor your clock to the old time zone and slow adjustment — set an alarm and get back into daylight.
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