How to get over jet lag fast

Jet lag isn't just travel tiredness — it's a temporary mismatch between your internal body clock and the local time at your destination. You can't switch that clock instantly, but you can help it catch up faster with a few well-timed moves.

Why jet lag happens

Your body runs on a roughly 24-hour circadian rhythm, tuned largely by light. Cross several time zones quickly and that rhythm is suddenly out of step with the sun outside, which is what produces the fatigue, poor sleep, brain fog, and digestive upset. The NHS notes that symptoms are usually temporary and tend to be worse the more time zones you cross.

East is harder than west

Travel direction changes the difficulty. Flying west lengthens your day, and most people find it easier to stay up later than to force sleep early. Flying east shortens your day and asks you to sleep before you're tired, which is tougher. The Sleep Foundation describes a common rule of thumb: expect roughly one day of adjustment per time zone crossed — a ceiling to beat, not a fixed sentence.

Shift your clock before you fly

You don't have to wait until you land. In the few days before an eastbound trip, try going to bed and waking an hour earlier each day; for westbound, an hour later. Even a partial head start means less to make up on arrival.

Use light — it's your strongest lever

Light is the main signal that resets the body clock, so timing your exposure is the most powerful thing you can do:

• Flying east: seek bright morning light at your destination and avoid it in the late evening, to nudge your clock earlier.
• Flying west: get light in the late afternoon and evening to push your clock later.
• Get outside for natural daylight where you can — it's far stronger than indoor lighting.

The supporting cast

• Set your watch to the destination when you board, and eat and sleep on that schedule as soon as it's reasonable.
• Be strategic with caffeine. It can help you stay awake during the local day, but stop well before bedtime so it doesn't wreck the night.
• Stay hydrated and go easy on alcohol, which fragments sleep.
• Melatonin is used by some travelers to help shift sleep timing. The NHS mentions it as an option for adults — availability and rules vary by country, so check with a pharmacist or doctor before relying on it.
• Short naps (20–30 minutes) can take the edge off without wiping out that night's sleep.

When it's more than jet lag

Normal jet lag eases within a few days. If sleep problems persist well beyond that, or you're managing a health condition affected by travel and sleep timing, talk to a healthcare professional. This article is general guidance, not medical advice — see our Medical Disclaimer.