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.

Name: 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 indeed the body's internal clock that controls circadian rhythms, including the sleep-wake cycle and mental alertness cycle.

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