WAKEFUL

adj. 1 awake, sleepless, waking, unsleeping, restless, restive, insomniac The children were wakeful the entire night in anticipation of a visit from Santa Claus 2 watchful, (on the) alert, on the qui vive, sharp, attentive, vigilant, wary, cautious, observant, heedful, on the lookout We remained wakeful, alert to any footstep