What to Do in the 3 Days Before Departure to Reduce Jet Lag

Most people treat jet lag as something that starts when the plane lands. In reality, the most effective interventions start before you even reach the airport — because your circadian clock can begin shifting toward your destination's schedule while you're still at home.

Work out how many time zones you're crossing and in which direction. Plan on roughly one day of adjustment per time zone, and note whether you're traveling east (harder) or west (easier).

If you're flying east, start shifting your bedtime and wake time 20–30 minutes earlier each day. If flying west, shift 20–30 minutes later. For a 6-hour time difference, three days of small shifts gets you roughly 60–90 minutes closer to your destination's schedule before you've even left.

Pair your sleep shift with light exposure. If shifting earlier (eastward), get bright light — ideally outdoors — soon after your new, earlier wake time, and dim your evening environment an hour or two before bed. If shifting later (westward), do the reverse.

This is also a good day to check whether melatonin makes sense for your itinerary and, if so, source it — availability and legal status vary by country.

The night before a long-haul flight is not the night to stay up finishing packing. Poor sleep before departure compounds jet lag rather than existing separately from it — you're not just fighting circadian misalignment on arrival, you're fighting it while sleep-deprived.

Reduce alcohol and heavy, late meals the night before flying — both fragment sleep independently of any circadian issues.

The moment you board, set your watch (and mentally reframe your day) to the destination's time zone. Decide in advance when you'll try to sleep on the plane based on the destination's night hours, not your own tiredness. An eye mask, earplugs, and a neck pillow packed in your carry-on make this easier to act on rather than just intend.

None of these steps eliminate jet lag entirely, but stacked together, travelers using pre-trip circadian shifting consistently report faster functional recovery than those who start adjusting only after landing.