Mental or Behavioral Dysfunction
primary hypersomnia
Definitions related to primary hypersomnia:
  • Excessive daytime sleepiness with a central nervous system origin.
    NICHD Pediatric Terminology
    U.S. National Cancer Institute, 2021
  • (idiopathic hypersomnia) A disorder of central nervous system etiology characterized by excessive sleepiness during the daytime.
    NCI
    U.S. National Cancer Institute, 2021
  • In 1966, William Dement proposed that patients with excessive daytime sleepiness, but without cataplexy, sleep paralysis, or sleep-onset rapid eye movement (REM), should not be considered narcoleptic. In 1972, Roth et al described a type of hypersomnia with sleep drunkenness that consists of difficulty coming to complete wakefulness,...
    Medscape
    WebMD, 2025
Try this search on: Farlex, Merriam-Webster, Oxford Dictionary, or Wordnik

This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.