July 2026 · Travel science
Jet Lag Is a Light Problem, Not a Sleep Problem
Most jet lag advice focuses on sleep: nap or don't nap, take melatonin, power through. But the thing that actually resets your circadian rhythm is light, specifically when your eyes see it relative to your body's internal clock.
Traveling east means your body needs to catch up to a later time. Get outside in the morning at your destination and avoid bright light in the evening for the first two or three days. Traveling west works the opposite way: seek out afternoon and evening light, and don't fight the urge to stay up a little later than usual.
If the time difference is more than five or six hours, start shifting a day or two before you fly, moving your bedtime by 30 to 60 minutes in the direction you'll need once you land. It's a small adjustment, but it means your first real day at the destination isn't spent recovering from the flight.
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