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.
Analogy
Think of your circadian rhythm like an internal clock running in the background of your brain. It cycles between sleepiness and alertness at regular intervals. This clock is set by the amount of light you get each day.
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.
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