The circadian rhythm is an internal 24-hour clock that causes different hormones to release. View Source at different times of day to either promote sleep or energize the body and mind. We also cycle through four sleep stages. View Source as we sleep, and wake up more easily at certain points of this cycle than others.
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The circadian rhythm is an internal 24-hour clock that causes different hormones to release. View Source at different times of day to either promote sleep or energize the body and mind. We also cycle through four sleep stages. View Source as we sleep, and wake up more easily at certain points of this cycle than others.