hypersomnia

Definitions of hypersomnia
  1. noun
    an inability to stay awake
    see moresee less
    antonyms:
    insomnia
    an inability to sleep; chronic sleeplessness
    types:
    catalepsy
    a trancelike state with loss of voluntary motion and failure to react to stimuli
    narcolepsy
    a sleep disorder characterized by sudden and uncontrollable episodes of deep sleep
    type of:
    sleep disorder
    a disturbance of the normal sleep pattern
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