Why does sunlight help with jet-lag?

Sunlight helps with jet lag by regulating the body's circadian rhythm, which is the internal biological clock that governs sleep-wake cycles. Exposure to natural light helps signal to the brain when it's time to be awake or asleep, aiding in the adjustment to a new time zone. By synchronizing your internal clock with the local time through sunlight, you can reduce fatigue and improve overall well-being while traveling.