Jet lag happens because your internal clock is still set to the time zone you left. Light, meals, and sleep are the signals that move it, and light is by far the strongest. A little preparation before the flight and a disciplined first day on the ground usually shorten the adjustment by a day or two.
This guide covers the days before departure, the flight and arrival day, and the following couple of days while your clock catches up.
How to use this guide
Work through the illustrated steps in order. Every step has its own picture, so you can check what a finished stage should look like before you move on. If you only have a minute, skim the Quick steps box above and come back for the details.
Related guides
- How to Find Cheap Flights
- How to Plan a Weekend Trip on a Budget
- How to Pack a Suitcase Efficiently
- How to Pack a Carry-On
- Browse all Travel & Outdoors guides
- All HowCompass guides
Trusted external resources
- U.S. Transportation Security Administration — 3-1-1 liquids rule
- U.S. Transportation Security Administration — what you can bring
- Federal Aviation Administration — Pack Safe guidance
A note on sources
We check each guide against the official resources listed in References at the end of this article. External links open in a new tab; the related guides above stay on this site.
Quick steps
- Shift bedtime by an hour or two toward your destination before flying
- Set your watch to local time as soon as you board
- Get outdoor daylight and stay awake until a reasonable local bedtime
Things you'll need
- Your itinerary with time zones
- A phone or watch you can reset
- An eye mask and earplugs
- A reusable water bottle
- Comfortable layers for the plane
- Access to outdoor daylight on arrival
Step-by-step
Method 1 of 3: Prepare Before You Fly :: Small shifts before departure are easier than a full reset after landing.
Step 1: Work out the time difference
Note how many zones you cross and in which direction. If conditions are different today, adjust one thing at a time and leave everything else unchanged.
Step 2: Choose a flight with a helpful arrival time
Arriving in the late afternoon makes it easier to stay up until local bedtime. Check the edges and the parts you cannot see easily; those are where most beginners miss something.
Step 3: Shift bedtime one hour a night
Move gradually toward destination time for two or three nights. Use a light touch first; pressure and extra material are much easier to add than to remove.
Step 4: Shift meal times slightly too
Meals are a weaker clock signal but they help. Give this stage a couple of minutes before moving on, because rushing here is the usual reason your body clock ends up uneven.
Step 5: Set your watch to destination time at boarding
Thinking in local time starts the adjustment early. When in doubt, pause and compare against the picture above before continuing.
Step 6: Avoid a big farewell late night
Starting the trip sleep deprived makes everything harder. Keep the same order every time, since a fixed sequence is easier to repeat than a list of separate decisions.
Step 7: Pack an eye mask and earplugs
Controlling light and noise makes plane sleep possible. A slightly imperfect result here is fine and can be corrected later; a rushed fix usually costs more time.
Step 8: Bring an empty bottle to fill after security
Steady hydration helps you feel better even though it does not reset the clock. Let it settle for a moment before judging the result, since the first impression often changes.
Keep going: How to Plan a Weekend Trip on a Budget uses the same illustrated format and is a good next read. More checklists live in the Travel & Outdoors category.
Method 2 of 3: Manage the Flight and Arrival Day :: Treat the destination clock as real from the moment you board.
Step 9: Sleep only when it is night at your destination
Use the mask and skip the film if local time says sleep. Stop and tidy up as soon as this part is done, so the next stage starts from a clear surface.
Step 10: Stay awake when it is daytime there
Walk the aisle and keep the window shade up. Put the tools back in the same place afterward, so the next session starts without a search.
Step 11: Limit alcohol and heavy in-flight meals
Both fragment sleep and leave you groggier on arrival. Repeat the same motion at a steady pace rather than varying it, which keeps the finish consistent.
Step 12: Drink water regularly through the flight
Dry cabin air makes fatigue feel worse. Keep everything you might need within reach before starting, so you are not searching mid-step.
Step 13: Move during the last hour of the flight
A short walk and some stretches wake the body up. Note what you changed, because the same adjustment usually applies the next time you work on your body clock.
Step 14: Get outdoors soon after landing
Daylight is the strongest signal for a new time zone. Choose the gentlest option that still works, then increase only if the result is not holding.
Step 15: Keep the first nap to twenty minutes
Set an alarm and get up when it rings. Read the label or the guidance for your body clock once before acting, since small differences matter here.
Step 16: Take a gentle walk rather than a workout
Movement plus light helps without adding exhaustion. If you are unsure, do less than you think you need and check again; you can always repeat the step.
Step 17: Eat meals at local times
Even a small meal tells your body when the day is. Finish with a quick check of the whole area rather than only the part you just handled.
Step 18: Stop caffeine by early afternoon
Late coffee easily costs you the first full night. Use a timer or a quick count rather than guessing, especially on your first few attempts.
Step 19: Keep the first evening simple
Unpack, shower, and avoid a demanding plan. Photograph or jot down the finished stage once, which gives you a reference for the next attempt.
Step 20: Make the room cool and dark
A good sleep environment matters most on night one. Work in small passes and look at the result after each one, so a slip is easy to fix while it is still small.
Step 21: Go to bed at a reasonable local hour
Resist the urge to turn in at six in the evening. If conditions are different today, adjust one thing at a time and leave everything else unchanged.
Keep going: How to Pack a Suitcase Efficiently uses the same illustrated format and is a good next read. More checklists live in the Travel & Outdoors category.
Method 3 of 3: Settle In Over the Next Two Days :: Consistency finishes what daylight started.
Step 22: Get up at local time even after a poor night
A late lie-in keeps the old clock in place. If you are unsure, do less than you think you need and check again; you can always repeat the step.
Step 23: Seek morning light on eastward trips
Early daylight helps you advance the clock. Check the edges and the parts you cannot see easily; those are where most beginners miss something.
Step 24: Seek late afternoon light after westward travel
Later light helps delay the clock. Keep everything you might need within reach before starting, so you are not searching mid-step.
Step 25: Keep naps short and early
A late long nap pushes bedtime further away. Read the label or the guidance for your body clock once before acting, since small differences matter here.
Step 26: Stay hydrated and eat normally
Regular meals and fluids support the reset. Finish with a quick check of the whole area rather than only the part you just handled.
Step 27: Schedule important decisions later
Reaction time and judgement are dull for a day or two. Repeat the same motion at a steady pace rather than varying it, which keeps the finish consistent.
Step 28: Use a wind-down routine you already know
Familiar cues help sleep arrive in a new place. Work in small passes and look at the result after each one, so a slip is easy to fix while it is still small.
Step 29: Avoid bright screens right before bed
Strong light late at night works against you. Note what you changed, because the same adjustment usually applies the next time you work on your body clock.
Step 30: Allow roughly a day per zone crossed
Expecting a two day adjustment for two zones keeps you patient. A slightly imperfect result here is fine and can be corrected later; a rushed fix usually costs more time.
Step 31: Note what worked for the next trip
Direction, flight time, and light timing are worth remembering. Use a light touch first; pressure and extra material are much easier to add than to remove.
Keep going: How to Pack a Carry-On uses the same illustrated format and is a good next read. More checklists live in the Travel & Outdoors category.
Tips
- For eastward trips, going to bed earlier for a few days before departure helps most; for westward trips, staying up a little later does.
- A twenty minute nap is useful, while a three hour nap usually costs you the whole night. For another walkthrough, see How to Find Cheap Flights.
- Keep the first day light, since a demanding schedule makes the clock shift harder to notice.
Warnings
- Ask a clinician before using melatonin or sleep medication, especially if you are pregnant, on other medication, or travelling with children. Official guidance: U.S. Transportation Security Administration.
- Do not drive a car after a long overnight flight if you are seriously sleep deprived.
Frequently asked questions
How long does jet lag last? Roughly a day per time zone crossed for many travellers, though light exposure can shorten it.
Should I sleep on the plane? Only if it is night at your destination.
Does exercise help? A short walk in daylight helps; a hard workout late at night can delay sleep.
References
- U.S. Transportation Security Administration — 3-1-1 liquids rule. https://www.tsa.gov/travel/security-screening/liquids-rule
- U.S. Transportation Security Administration — what you can bring. https://www.tsa.gov/travel/security-screening/whatcanibring
- Federal Aviation Administration — Pack Safe guidance. https://www.faa.gov/hazmat/packsafe
- International Air Transport Association — baggage guidance. https://www.iata.org/
- U.S. Department of State — travel information. https://travel.state.gov/
Every guide is reviewed against its sources. See our editorial policy.
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