'fall asleep' definitions:

Definition of 'fall asleep'

From: WordNet
verb
Change from a waking to a sleeping state; "he always falls asleep during lectures" [syn: fall asleep, dope off, flake out, drift off, nod off, drop off, doze off, drowse off] [ant: arouse, awake, awaken, come alive, wake, wake up, waken]