The suprachiasmatic nucleus is the body's internal "clock" that governs the timing of circadian rhythms, including the sleep-wake cycle and the mental alertness cycle.

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The suprachiasmatic nucleus (SCN) is a small group of specialized cells in the hypothalamus that serves as the primary pacemaker for circadian rhythms in mammals, including humans. It helps regulate various physiological processes, such as hormone release, body temperature, and activity levels, based on the time of day.

The Suprachiasmatic Nucleus Is the Body's Internal "Clock" That Governs