Land feeling like yourself.
Tell it where your family is flying and when everyone normally sleeps. It works out, for each person, when to sleep and when to get light in the days before you go — so your body clock arrives when you do.
How it works
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1. Your body has a clock
It decides when you feel sleepy and when you feel awake. It's set to the place you live, and it doesn't change just because you got on a plane. That mismatch is jet lag.
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2. Light is what moves it
Bright light in the morning nudges your clock earlier. Bright light in the evening nudges it later. Getting light at the wrong time pushes it the wrong way, which is why this is worth planning.
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3. It moves about an hour a day
So if you're going somewhere six hours ahead, you start a few days early and shift a bit at a time. That's the plan this makes: a card for each day, for each person, telling you what to do.
Where this comes from
The timings follow published sleep research — mainly Eastman and Burgess's work on shifting body clocks before travel. It's the same science behind apps like Timeshifter.