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Saved scenariosAccessibility and display settingsFollow a representative body-clock shift over the week after an eastward flight across six time zones.
The pacemaker's timing reaches tissues through rhythmic signals carried in the circulation. The evening rise in melatonin is the phase marker most often measured in travel studies, and it moves gradually as the clock resynchronises.
Each day the internal schedule moves a little toward local time. Reported eastward shifts are on the order of about an hour a day, so several time zones mean several days, and the direction of travel changes the pace.
While internal and local time disagree, night sleep is often fragmented, daytime alertness dips, and appetite and digestion can arrive at an unfamiliar hour. These ease as the offset narrows.
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Time elapsed
Local clocks have moved six hours ahead; the internal schedule is still close to the departure zone, so the displayed offset is at its widest.
A flight moves local clock time by hours. The internal circadian schedule that times sleep, alertness, hormone release and digestion stays close to the timing of the departure zone.
Crossing several time zones faster than the circadian system can follow typically leaves internal body timing out of step with local clock time, and that misalignment is what generates jet-lag symptoms. moderate · View sources