The most powerful jet lag treatment isn't a pill — it's light. Your body clock resets primarily by responding to when you see bright light and darkness, which means you can actively drag it toward local time faster than it would drift alone. Add well-timed meals and a smart sleep strategy and most people can cut their jet lag noticeably, medication or not. Here's how to use each lever.
Light: the master switch
Light is the strongest signal your body clock has — far stronger than melatonin — so getting it right does the heavy lifting. The principle: seek light when you want to be awake and alert at your destination, avoid it when you want your body to think it's night.
The direction of travel flips the strategy:
- Flying east (need to wake/sleep earlier): get morning light at your destination — it shifts your clock earlier. Be cautious with late-evening light, which pulls the wrong way
- Flying west (need to stay up later): seek evening/late-afternoon light and go easy on very early-morning light, to hold your clock later
"Light" ideally means natural daylight — a morning walk outdoors beats any indoor lighting, and even an overcast sky is far brighter than a room. There's a subtlety worth knowing: for big eastward trips, in the first day or two your body's "biological morning" may still be on home time, and blasting light at the wrong moment can shift you backwards — one reason a structured plan (or a clinician's steer) helps on long hauls. But as a general rule for most trips: chase daylight at your destination when you want to be up.
Sleep strategy: commit to local time immediately
The golden rule: on arrival, live by destination time at once — eat, sleep and wake on the local schedule even if your body protests. A few tactics that help you hold the line:
- The nap trap: arriving daytime and exhausted, a monster nap wrecks that night's sleep and prolongs jet lag. If you must, cap it at 20–30 minutes, early afternoon only
- Arriving in the evening? Try to stay up until a normal local bedtime, then sleep — you'll often reset fastest
- Guard the sleep you get: cool dark room, eye mask and earplugs, no screens in the hour before bed (screen light suppresses your natural melatonin), easy on caffeine after local midday and alcohol at night
- Short trips (1–2 days): sometimes it's easier not to fully adjust — stay on home time if your schedule allows, and skip the whole reset
Food: a secondary clock
Meal timing is a weaker cue than light, but a real one — your digestive system has its own clock that helps anchor the master one. Shift your meals to local time as fast as you comfortably can, even when your appetite is on home schedule; eating a proper local breakfast is a useful "it's morning" signal. Keep meals lighter for the first day or two while your gut catches up (misaligned digestion is why jet lag brings nausea and constipation), favour protein and vegetables over heavy carb-and-sugar loads that spike then crash your energy, and don't go to bed either stuffed or starving — both fragment sleep. The much-hyped rigid "jet lag diets" have thin evidence; simply moving mealtimes to local time is the part that helps.
Hydration and the flight itself
Some of what feels like jet lag is plain dehydration from dry cabin air. Drink water steadily through the flight, go easy on alcohol and caffeine aloft (both dehydrate and disrupt sleep), move around regularly, and — the pro move — start living on destination time the moment you board: set your watch, and time your in-flight sleeping and eating to your destination, not the airport you left.
Putting it together: a simple eastbound example
UK to, say, the Middle East or Asia (eastward): on the plane, shift toward destination sleep time; on arrival, get out into morning daylight, eat meals on local time, resist the big afternoon nap, stay up until a normal local bedtime, and protect that night's sleep. Repeat for a couple of days and your clock catches up far quicker than leaving it to drift. If you're also using melatonin, it slots in alongside this — timed to your direction (see when to take melatonin for your direction of travel) — but light and timing are doing most of the work.
Frequently asked questions
What's the fastest way to get over jet lag?
Well-timed light exposure at your destination, immediately adopting local sleep and meal times, avoiding long naps, and staying hydrated. Light is the most powerful lever — direction of travel decides whether you chase morning or evening light.
Should I get sunlight when I arrive?
Usually yes — daylight when you want to be awake locally helps reset your clock. Flying east, prioritise morning light; flying west, later-day light. On very long eastward trips, timing matters enough that a structured plan helps.
Is it better to nap or push through on arrival?
Generally push through to a normal local bedtime. If you're unsafe-tired, a single 20–30 minute early-afternoon nap is the compromise — longer naps prolong jet lag.
Do jet lag diets work?
Rigid meal-plan "jet lag diets" have limited evidence. What helps is simply shifting your meals to local time and keeping them light for a day or two while digestion adjusts.
References
- Eastman CI, Burgess HJ. How to travel the world without jet lag. Sleep Med Clin. 2009;4(2):241–255.
- Burgess HJ, et al. Bright light, dark and melatonin can promote circadian adaptation. Sleep Med Rev. 2002.
- NHS. Jet lag. nhs.uk/conditions/jet-lag.
- Sack RL. Jet lag. N Engl J Med. 2010;362(5):440–447.