Jet Lag When Flying West

Flying west lengthens the day and asks your body clock to move later, which usually suits it better than the eastbound direction. The main challenge is not falling asleep too early on the first evening and waking long before dawn.

Why westbound is usually easier

Flying west lengthens your day and asks the body clock to delay, which is the direction it drifts naturally. Staying up a few hours later is something most people can do without much effort, which is why westbound recovery is often a day or two faster for the same distance.

The difficulty moves rather than disappearing. Instead of struggling to fall asleep, the problem westbound is fading in the early evening and then waking hours before dawn.

Shifting before you leave

Move bedtime and wake time later by 30 to 60 minutes a day, and get light in the evening rather than early in the morning. Because the direction is the easier one, less preparation is needed than for an eastbound trip of the same length.

Time zones westSuggested preparation
1–3No pre-shift needed
4–61–2 days, 1 hour later per day
7–92 days, 1 hour later per day
10 or more2–3 days, then rely on arrival-evening light

The daytime flight

Westbound long-haul flights typically leave in the morning or midday and land in the afternoon or evening, giving you an unusually long day. The aim is to arrive tired enough to sleep at a local bedtime.

  • Set your watch to destination time at boarding.
  • Stay awake, or limit yourself to one short nap early in the flight.
  • Keep the window shade up and stay in the light where you can.
  • Move around the cabin, which helps more than it sounds.
  • Save caffeine for the last few hours if you are struggling to stay awake.

Arrival evening and the first morning

  • Get outdoor light in the late afternoon and early evening on arrival day.
  • Do not go to bed early, however tempting — aim for a normal local bedtime.
  • Eat dinner at a local hour rather than when your body asks for it.
  • Keep the room dark in the early hours, and use an eye mask for the 4am waking that often comes.
  • If you wake very early, stay in dim light and rest rather than getting up into bright light, which would reinforce the early schedule.

What tends to go wrong

  • Sleeping through a westbound daytime flight and then being wide awake at midnight.
  • Going to bed at 7pm on arrival day and waking at 2am.
  • Bright morning light in the first days, which pulls the clock earlier — the wrong direction westbound.
  • Treating the early waking as permanent and giving up on the local schedule.

Frequently asked questions

Is jet lag easier flying west?

For most people, yes. The body clock naturally drifts later than 24 hours, so a westbound trip works with that drift rather than against it. Recovery is often a day or two faster for the same number of time zones.

How do I prepare for a westbound flight?

Shift bedtime and wake time later by 30–60 minutes a day for a couple of days beforehand, and get light in the evening rather than early morning. Even one day of shifting helps.

Should I sleep on a westbound daytime flight?

Generally no, or only briefly. Westbound flights often land in the afternoon or evening, so staying awake makes it easier to sleep at a normal local bedtime rather than at 3am.

Why do I wake up at 4am after flying west?

Because your body clock still thinks it is late morning. Evening light exposure, a bedtime that is not too early, and keeping the room dark in the early hours all help pull the wake time later.