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Why Do Humans Need Sleep?
The longer we are awake, the more a denticine accumulates in our brain. The feeling of sleepiness is independent of time of day or night. How sleepy we get depends on where we are in this so-called circadian cycle. That oscillation takes 24 hours plus or minus an hour. And I don't think it's a coincidence that it's aligned to the 24-hour spin of the earth on its axis.