Circadian rhythm sleep disorders are disruptions of the natural biological cycles that control how people are attuned to night and day.

The term circadian comes from Latin words that literally mean around the day.

The daily cycle of life, which includes sleeping and waking, is called a circadian (meaning "about a day") rhythm, commonly referred to as the biologic clock.

Hundreds of bodily functions follow biologic clocks, but sleeping and waking comprise the most prominent circadian rhythm. The sleeping and waking cycle is approximately 24 hours.

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