Circadian Rhythm

Definition

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.

Related terms

Melatonin:

A hormone produced by the pineal gland at night or in response to darkness. It plays a crucial role in regulating sleep-wake cycles.

Suprachiasmatic Nucleus (SCN):

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.

Jet Lag:

A temporary disorder resulting from travel across time zones, which disrupts your body's internal clock or circadian rhythm.