Jet lag isn’t really about being tired. It’s a clock stuck in the time zone you left — and once you see it that way, the fixes get obvious.
If your work puts you on planes, you already know this. You can be exhausted and still lie awake at 3am in a hotel room, wide-eyed, because your body is convinced it’s the middle of the afternoon. That’s the actual problem: not a lack of sleep, but a body clock still running on home time.
Understand it as a clock problem and the fixes become obvious — and far more effective than “try to sleep on the plane.”
Why jet lag happens
Your circadian rhythm is anchored to the light-dark cycle of wherever you’ve been living. Fly across several time zones in a few hours and your internal clock doesn’t move with you — it lags behind, hence the name. Your body wants to sleep, eat and peak in alertness on the old schedule while the new destination demands a different one.
The rule of thumb is that your clock shifts roughly one time zone per day on its own. Cross eight zones and, unmanaged, you’re looking at the better part of a week to feel normal. For a three-day trip, that’s the entire trip spent adjusting. The goal of any protocol is simple: shift the clock faster than one zone a day.
Why east is worse than west
Flying west (chasing the sun, lengthening your day) is easier than flying east (shortening it). Your body finds it more natural to stay up later than to force itself to sleep earlier. So eastward trips — and the return leg home if you went west — need the most deliberate management.
The protocol: shift the clock on purpose
Before you fly
- Shift your schedule in advance if the trip’s long enough. For a multi-day trip east, going to bed and waking an hour earlier for two or three nights beforehand gives your clock a head start. Heading west, shift later.
- Set your watch to the destination time when you board. It sounds trivial; it reframes every decision on the flight around the time zone you’re moving to.
On the plane
- Eat and sleep on destination time, not departure time. If it’s night where you’re going, try to sleep even if it’s daytime back home. If it’s daytime there, stay awake.
- Be ruthless about caffeine and alcohol. A cabin glass of wine feels like it’ll help you sleep; in reality it wrecks the quality of whatever sleep you get, and cabin dehydration makes the next day worse. Caffeine timed wrong locks your clock to the old zone.
When you land — light is your lever
This is the most powerful tool you have, and it’s free. Light is the master signal that sets your clock, so getting it at the right time — and avoiding it at the wrong time — drags your rhythm into line faster than anything else.
- Flown east? Seek bright morning light at your destination and avoid late-evening light. You’re telling your clock to move earlier.
- Flown west? Get light in the late afternoon/early evening and go easy on early-morning light. You’re pushing your clock later.
- Get outside. Outdoor daylight is many times brighter than indoor lighting, even on an overcast day. A walk on arrival is worth more than any supplement.
The first night
Resist the urge to crash at 6pm. Push through to a normal local bedtime even if you’re flagging — going to bed too early just guarantees a 2am wake-up and resets the struggle. Get your body into the destination’s night, and let the clock start catching up.
Where most travellers go wrong
The classic mistakes: napping for hours on arrival (drains your sleep pressure so you can’t sleep that night), using alcohol to force sleep (destroys the recovery you desperately need), and reaching for melatonin as a sledgehammer. On that last one — melatonin’s narrow, evidence-based use is small amounts for timing, not the large bedtime doses most people take; if that’s the route you’re weighing, it’s worth understanding what melatonin does and doesn’t do. The bigger levers are light, timing and consistency, which is where your effort actually pays off.
Supporting recovery on the road
Travel stacks every sleep stressor at once: a scrambled clock, dehydration, disrupted routine, restaurant food, and the stress of performing in a new place. You can’t control all of it, but you can protect your wind-down — keeping one consistent pre-sleep ritual that travels with you is one of the few stable signals your clock can hold onto when everything else has moved. The same “keep the ritual, lose the guesswork” logic shows up in the viral bedtime mocktail a lot of travellers fall back on.
One ritual that travels with you
A consistent wind-down is one of the few signals your body clock can hold onto on the road. Moongreens is a melatonin-free night recovery drink built to calm your nervous system and support deep, restorative sleep — wherever you are. Made in the USA, backed by a 90-night trial.
Try Moongreens →Frequently asked questions
How long does jet lag last?
Untreated, your body clock shifts roughly one time zone per day, so crossing many zones can take the better part of a week. A deliberate light, timing and sleep protocol can shift it faster.
Is jet lag worse flying east or west?
East is usually harder, because it shortens your day and forces you to sleep earlier than your body wants. Flying west lengthens the day, which is easier to adapt to.
What’s the fastest way to beat jet lag?
Light timed correctly for your direction of travel is the strongest lever — morning light flying east, late-afternoon light flying west — alongside shifting to destination time immediately and avoiding alcohol and long arrival naps.
Should I nap when I land?
Keep it short, 20 minutes at most, and early. Long arrival naps drain your sleep pressure and make it harder to sleep at the local bedtime, prolonging the adjustment.
This article is for educational purposes and isn’t medical advice. Speak to a doctor before changing how you manage your sleep.
About the author
James Higgins is the founder of Moongreens. He created Moongreens after two decades of broken sleep as a high performer with an overactive mind.