Researchers believe that the suprachiasmatic nucleus acts as

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The suprachiasmatic nucleus (SCN) is a group of cells in the hypothalamus of the brain that is responsible for regulating the circadian rhythm, also called our biological clock. It receives signals from the environment, such as light and darkness, and sends signals to other parts of the brain and body to help regulate our sleep-wake cycle and other physiological processes that are timed to a 24-hour cycle.

Researchers Believe That the Suprachiasmatic Nucleus Acts as