Research

narcolepsy. An extreme tendency towards sleepiness often associated with cataplexy, in which sleep onset is accompanied by dreaming. Sleep paralysis and hypnagogic (during the process of falling asleep) hallucinations are accompanying features. Genetic factors have recently been shown to be involved.
>>cataplexy; sleep

cataplexy. The sudden loss of all muscle tone. It is usually associated with narcolepsy.

Cambridge Encyclopedia: the Fourth Edition