Sleep Disorders, Circadian Rhythm

**Definition:** Dyssomnias associated with disruption of the normal 24 hour sleep wake cycle secondary to travel (e.g., JET LAG SYNDROME), shift work, or other causes.

**Tree numbers:** - C10.281.800 - C10.886.425.200 - C24.900 - F03.870.400.200

**Synonyms:** - Circadian Rhythm Sleep Disorder - Sleep-Wake Schedule Disorders - Sleep-Wake Cycle Disorders - Circadian Rhythm Sleep Disorders - Disturbed Nyctohemeral Rhythm - Sleep-Wake Cycle Disorder - Sleep-Wake Schedule Disorder