Sleep Disorders, Intrinsic

**Definition:** Dyssomnias (i.e., insomnias or hypersomnias) associated with dysfunction of internal sleep mechanisms or secondary to a sleep-related medical disorder (e.g., sleep apnea, post-traumatic sleep disorders, etc.). (From Thorpy, Sleep Disorders Medicine, 1994, p187)

**Tree numbers:** - C10.886.425.800 - F03.870.400.800

**Synonyms:** - Intrinsic Sleep Disorders