Circadian rhythm is a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.
Circadian rhythm is influenced by external factors like light and temperature, and it helps control various physiological processes including hormone release, eating habits, digestion, and body temperature.
The primary regulator of the circadian rhythm is the suprachiasmatic nucleus (SCN) in the hypothalamus of the brain, which responds to light cues received through the eyes. Disruptions to the circadian rhythm, such as those caused by shift work, travel across time zones, or exposure to artificial light, can affect overall health and well-being.