narcolepticEnglishOxford Dictionary of Englishnarcoleptic /ˌnɑːkə(ʊ)ˈlɛptɪk / Medicine ▸ adjective affected by or relating to an extreme tendency to fall asleep: he is narcoleptic, so he takes a drug that helps keep him awake a narcoleptic coma. ▪ tending to induce sleep; soporific: narcoleptic drugs a plot so tired it's narcoleptic figurative. ▸ noun a person affected by an extreme tendency to fall asleep: a narcoleptic who falls asleep up against the wall.