The small adjustment that is necessary to help people synchronize the human internal "pacemaker" with a 24-hour cycle is brought about by

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Exposure to sunlight is crucial for synchronizing the human internal "pacemaker," or circadian rhythm, with the 24-hour cycle. Sunlight affects the production of melatonin, a hormone that regulates sleep-wake cycles, helping to adjust our internal clocks.

The Small Adjustment That Is Necessary to Help People Synchronize