Your body's natural sleep-wake cycle is programmed by a group of brain cells called the ____.

Name: Your body's natural sleep-wake cycle is programmed by a group of brain cells called the ____.
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The suprachiasmatic nucleus (SCN) is a group of cells in the hypothalamus that regulate the body's circadian rhythm or sleep-wake cycle. The SCN receives input from the eyes about light and darkness and adjusts the production of melatonin, a hormone that regulates sleep.

Your Body's Natural Sleep-Wake Cycle Is Programmed by a Group