Jet Lag Sleep Calculator
A jet lag sleep calculator helps you plan when to sleep, wake, and nap when your body clock and the local clock are suddenly far apart.
No calculator can remove jet lag instantly, but better timing for sleep, naps, and light exposure can reduce the damage after long flights.
Open the sleep calculator Nap calculator Wake-up time calculatorHow to use sleep planning for jet lag
Think in destination time
The sooner your decisions follow the destination clock, the easier it is to start adapting.
Protect the first main night
Your first full sleep window after arrival usually matters more than trying to optimize every hour on the plane.
Use naps carefully
Short naps can prevent crash-level fatigue, but long late naps often delay adjustment.
Before travel
- Shift bedtime and wake-up time in small steps if you know the trip is coming.
- Choose a realistic target for the first morning at your destination.
- Decide in advance whether you will stay awake until local bedtime or use one short recovery nap.
Example: arriving exhausted in the evening
If you land at 7:00 PM local time, the calculator is more useful for planning the first night and first morning than for squeezing perfect sleep out of the flight itself.
The main question becomes: can you make it to a sensible local bedtime, or do you need one short nap to avoid crashing too early?
After arrival
Get light at the right time
Morning light often helps earlier adjustment, while late-night bright light can keep sleep pushed later.
Eat on local time
Meals alone do not fix jet lag, but they help reinforce the new schedule.
Accept an imperfect first night
The first one or two nights may be messy. The goal is faster stabilization, not one flawless sleep session.
Common jet lag mistakes
- Taking long naps too late in the day and delaying the first local bedtime.
- Continuing to think in home time for too long after arrival.
- Expecting the in-flight sleep plan to matter more than the first 24 hours on the ground.
- Using bright light and screens at the exact time you are trying to become sleepy.