Jet Lag Recovery Calculator: Personalized Sleep Shift Plan
- Jet lag is a temporary misalignment of your circadian clock with local day–night time after crossing time zones [1]
- Jet‑lag calculators convert your itinerary and sleep times into evidence‑based light, sleep and melatonin schedules [6].
- Timed light and melatonin shift the SCN—morning light advances, evening light delays; resync takes days[2][3][6][4].
- Timed bright light and melatonin shift the circadian clock, but correct timing (not dose) is critical [6][7].
- Recovery from jet lag takes several days and is direction-dependent: westward travel is often easier than eastward...
- Timed light and melatonin may help jet‑lag, but evidence is limited, variable, and timing is critical [9][7][8]






