Time zones crossed
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Jet lag severity
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Full recovery
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on the ground
📈 Severity gauge
💡 Your jet lag reset plan
What actually causes jet lag
Jet lag happens when your internal body clock no longer matches local daylight. Light is the strongest signal your brain uses to reset it — which is why timing light exposure is the number one weapon.
Direction matters
Traveling east is harder than west for most people. Going west your day lengthens; going east shortens it, and a shorter day is tougher to adjust to.
Light is the reset button
Bright light in the morning shifts your clock earlier; bright light in the evening shifts it later. Get the timing right and you adapt about twice as fast.
One day per zone
On average, your body clock shifts about one time zone per day. A 7-zone flight from New York to Dubai takes roughly a week to fully adapt.
Flying there soon?
Check the exact time difference and pick the right meeting windows.
Time Zone Converter