English▸ 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
figurative a plot so tired it's narcoleptic.
▸ noun a person affected by an extreme tendency to fall asleep:
a narcoleptic who falls asleep up against the wall.