Drift off is a term used to describe the process of falling asleep. NOD, DROWSE, DOZE, and gotosleep are all synonyms for drift off. NOD is a three letter word meaning to lower and raise the head slightly and briefly as an expression of weariness or agreement. DROWSE is a six letter word meaning to be in a half-awake state. DOZE is a four letter word meaning to sleep lightly or briefly. Gotosleep is a nine letter word meaning to fall asleep.