1. There is a persistent or recurrent pattern of sleep disturbance due primarily to one of the following:
   • Alterations of the circadian time keeping system
   • Misalignment between the endogenous circadian rhythm and exogenous factors that affect the timing or duration of sleep
2. D. circadian-related sleep disturbance leads to insomnia, EDS, or both
3. The sleep disturbance is associated with impairment of social, occupational, or other areas of functioning

Circadian Sleep Disorders