Light
Circadian rhythms are physical, mental, and behavioral changes that follow a daily cycle. They respond primarily to light and darkness in an organism's environment.
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A hormone produced by the pineal gland at night or in response to darkness. It plays a crucial role in regulating sleep-wake cycles.
A group of cells located in the hypothalamus that control circadian rhythm. The SCN sets the pace for most cells and tissues in your body.
A temporary disorder resulting from travel across time zones, which disrupts your body's internal clock or circadian rhythm.