Circadian Rhythm

Circadian rhythm is the daily, monthly, and yearly pattern of changes in a living thing’s physiology that are regulated by the internal biological clock.

It’s the internal timekeeper that controls a human’s sleep-wake cycle. Circadian rhythms are the body’s natural rhythms, regulated by the brain, which are closely related to the environment and the seasons.

The term is used in a variety of contexts, such as biology, medicine, psychology, and sociology.

The word “circadian” comes from the Latin circa dies, meaning “about a day.”

The circadian rhythm is a biological cycle that occurs in all living organisms.