What Are Circadian Rhythm Disorders?

Circadian rhythm disorders are problems with your circadian rhythm, the "internal body clock" that keeps your biological processes in step. This cycle lasts about 24 hours. The term circadian comes from Latin words that mean “around the day.” Patterns of brain waves, hormone production, cell regrowth, and other activities are linked to this cycle.

Your circadian rhythm plays a key role in things like when you sleep and when you wake. Your normal circadian clock is set by the cycle of light and dark over 24 hours.

People with circadian rhythm disorders may have problems: