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Many aspects of mammalian behavior and physiology show circadian rhythmicity, including sleep, physical activity, alertness, hormone levels, body temperature, immune function, and digestive activity. Remarkably, all of these diverse rhythms are controlled by a single tiny brain area, the SCNThe SCN receives inputs from specialized photoreceptive retinal ganglion cells, via the retinohypothalamic tract.
Seems pretty unlikely, but could it be a body's way of getting more vitamin D?BTW, there is a theory that our ancestors were successful hunters because they had no hair on their bodies. This allowed them to run for very long periods and simply exhaust the animal they were hunting.