What Jet Lag Actually Does to Your Body Hour by Hour

In this reel

What jet lag does to your body in the first 24 hours after landing — it's more than just feeling tired Have you ever landed somewhere and felt off for days? Where were you flying?

Transcript

You just landed — but your body's still on yesterday's clock. Your circadian rhythm can only shift about one hour per day — so a nine-hour time difference takes nine days to fully reset. Here's the part nobody talks about — your liver, gut, and heart each run their own internal clocks, and they can desync from each other, not just from local time. In those first twenty-four hours, cortisol — your alertness hormone — may spike at night, while melatonin floods in mid-afternoon. That's why you feel wired at 2am and crash at lunch. The fastest reset? Morning sunlight. It's the strongest signal your brain uses to recalibrate your internal clock to local time. Follow for more travel science that's actually useful on your next trip.