Jet Lag Sleep Shift Planner
Enter your usual bedtime, time zones crossed, and days before departure to get a day-by-day pre-flight bedtime schedule for adjusting to jet lag.
Pre-flight shift achieved
5 of 8 hours
Remaining after arrival
3 hours
Typical full adjustment
~8 days
The 1-hour-per-day pre-flight shift and the roughly one-day-per-time-zone full adjustment afterward are commonly cited general guidelines from sleep-science sources, not a guaranteed personal timeline — actual adjustment speed varies by person, and eastward travel is generally reported as harder to adjust to than westward travel of the same size.
About this tool
How to use it
- Enter your usual bedtime.
- Enter how many time zones your trip crosses, and pick the direction (eastward makes bedtime earlier, westward makes it later).
- Enter how many days you have before departure to start adjusting.
- Press Build Shift Schedule, or just keep typing — the day-by-day table updates live.
- Follow the table's suggested bedtime each night leading up to your flight.
Why it matters
Trying to adjust to a large time difference all at once, on the day you fly, is a lot harder on the body than spreading the same adjustment across several days beforehand — a gradual shift gives your circadian rhythm a smaller nudge each day instead of one large jump. Seeing the exact bedtime for each specific night removes the guesswork of how much to shift and when to start.
When to use it
Useful in the days leading up to a long-haul flight across multiple time zones, especially for trips where minimizing jet lag matters (a short work trip, a big event on arrival) rather than a longer stay where natural adjustment time is less of a concern.
Good to know
The 1-hour-per-day pre-flight shift and the roughly one-day-per-time-zone full-adjustment estimate afterward are commonly cited general sleep-science guidelines, not a personalized or guaranteed timeline — actual adjustment speed varies significantly by person, age, and how much light exposure and other cues are also managed during the trip. Eastward travel (bedtime moving earlier) is generally reported as harder to adjust to than westward travel (bedtime moving later) of the same size, since it's usually easier for the body to stay up later than to fall asleep earlier than usual.
Common questions
Why is eastward travel harder than westward?
The human circadian rhythm naturally runs slightly longer than 24 hours for most people, which makes it easier to delay sleep (as westward travel requires) than to advance it earlier (as eastward travel requires) — this is a well-documented general pattern in sleep research, though individual experiences vary.
What if I don't have enough days before departure to fully pre-shift?
The schedule only shifts as far as the days available allow (capped at the total time difference), and the 'remaining after arrival' figure shows how much adjustment is left to happen naturally once you've landed — some post-arrival adjustment is normal even with a full pre-flight schedule.
How accurate is the 'typical full adjustment' estimate?
The roughly one-day-per-time-zone rule of thumb is a commonly cited general guideline, not a precise prediction for any individual — some people adjust faster, especially with good light exposure management on arrival, and some take longer.
Does this account for my flight's actual departure and arrival times?
No — this schedule only shifts your bedtime day by day before departure based on the time zones crossed and days available; it doesn't factor in the specific flight time, in-flight sleep, or arrival time of day, all of which also affect how jet lag actually feels.