Your personal jet lag app, timed by science.

The problem

Jet lag isn't just bad sleep.

Jet lag happens because your body clock is still synchronized with the time zone you left. Your brain continues to release hormones, trigger alertness, and prepare for sleep according to your previous schedule.

• The circadian rhythm regulates sleep, alertness, and hormone cycles.
• Crossing multiple time zones creates biological misalignment.
• Your body cannot instantly switch to the new schedule.

Trying to simply "sleep earlier" or "push through the fatigue" rarely works because the body clock shifts gradually.

Your body clock can shift

The circadian system responds to environmental signals called zeitgebers. The most powerful signal is light. The timing of light exposure can shift your body clock earlier or later.

• Correctly timed light accelerates circadian adaptation.
• Incorrect timing can delay adjustment.
• Sleep timing, caffeine timing, and melatonin can reinforce the shift.

Jetlag Coach calculates when these signals should occur during your trip so your body clock adapts faster.

The science

Built on circadian science.

Jetlag Coach is a jet lag app that applies decades of research in circadian biology (the same principles trusted in aviation, military operations, and elite sports) to generate a personalized plan for your trip.