(Video: Circadian rhythms) The most important factor for the timing of the circadian clock is

Question

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The circadian clock is primarily regulated by exposure to sunlight. The light-sensing cells in the retina of the eyes communicate with the suprachiasmatic nucleus (SCN) in the brain to synchronize the clock with the local time. This is why disruption of natural light exposure, such as staying up late or working night shift, can cause disturbances in the circadian rhythms. While social interaction, regular exercise, and a good night's sleep are important for overall health and can indirectly affect circadian rhythms, they are not as critical for the timing of the clock as sunlight exposure.

(Video: Circadian Rhythms) the Most Important Factor for the Timing