Circadian rhythms are what regulate your body wake/sleep cycle: they pretty much go in automatic, and tell your body when it is time to fall asleep and when it is time to be awake. The mechanism that regulates them is actually quite complex, and involves a couple of very small glands in the brain and a cascade of hormones, but to keep it simple I will focus on the two main hormones: melatonin and cortisol. Melatonin is the hormone that your body secrete when is dark and that makes you fall asleep, while cortisol is the hormone of stress and
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