The science of jet lag

How circadian rhythms work, why flying direction matters, and what actually helps reset your body clock.

Science guides

Melatonin for jet lag: dosage, timing, and what actually works
Melatonin can help with jet lag, but only if you get the dose and timing right. Most people take too much, too late. Here's what the science says.
Jet lag flying east vs west: why direction changes everything
Why is jet lag worse flying east? Your body clock runs longer than 24 hours, so eastbound travel is harder. Here's the science and what to do about it.
Light exposure and jet lag: when to seek and avoid sunlight
Light is the most powerful tool for resetting your body clock after travel. But getting the timing wrong can make jet lag worse. Here's how to get it right.