Disorders of Excessive Somnolence

Disorders characterized by hypersomnolence during normal waking hours that may impair cognitive functioning. Subtypes include primary hypersomnia disorders (e.g., IDIOPATHIC HYPERSOMNOLENCE; NARCOLEPSY; and KLEINE-LEVIN SYNDROME) and secondary hypersomnia disorders where excessive somnolence can be attributed to a known cause (e.g., drug affect, MENTAL DISORDERS, and SLEEP APNEA SYNDROME). (From J Neurol Sci 1998 Jan 8;153(2):192-202; Thorpy, Principles and Practice of Sleep Medicine, 2nd ed, p320)

Also Known As:

Hypersomnia; Hypersomnolence; DOES (Disorders of Excessive Somnolence); Excessive Somnolence Disorders; Hypersomnia, Recurrent; Hypersomnolence Disorders; Hypersomnolence Disorders, Primary; Hypersomnolence Disorders, Secondary; Primary Hypersomnolence Disorders; Secondary Hypersomnolence Disorders; DOESs (Disorders of Excessive Somnolence); Daytime Sleepiness, Excessive; Daytime Sleepinesses; Daytime Somnolences; Excessive Daytime Sleepinesses; Excessive Somnolence Disorder; Hypersomnia Disorder, Primary; Hypersomnia Disorder, Secondary; Hypersomnias; Hypersomnolence Disorder; Hypersomnolence Disorder, Primary; Hypersomnolence Disorder, Secondary; Primary Hypersomnia Disorder; Primary Hypersomnolence Disorder; Recurrent Hypersomnia; Recurrent Hypersomnias; Secondary Hypersomnia Disorder; Secondary Hypersomnolence Disorder; Sleepiness, Daytime; Sleepiness, Excessive Daytime; Somnolence Disorder, Excessive; Somnolence, Daytime; Daytime Sleepiness; Daytime Somnolence; Excessive Daytime Sleepiness; Primary Hypersomnia Disorders; Secondary Hypersomnia Disorders

Nervous System Diseases: 14737
- Sleep Wake Disorders: 3817
  - Dyssomnias: 27
    - Intrinsic Sleep Disorders: 11
      - Disorders of Excessive Somnolence: 2522
Mental Disorders: 25040
- Sleep Wake Disorders: 3817
  - Dyssomnias: 27
    - Intrinsic Sleep Disorders: 11
      - Disorders of Excessive Somnolence: 2522

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