'Wakeful' definitions:

Definition of 'wakeful'

From: WordNet
adjective
Carefully observant or attentive; on the lookout for possible danger; "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow" [syn: argus-eyed, open-eyed, vigilant, wakeful]
adjective
(of sleep) easily disturbed; "in a light doze"; "a light sleeper"; "a restless wakeful night" [syn: light, wakeful]
adjective
Marked by full consciousness or alertness; "worked every moment of my waking hours" [syn: waking, wakeful]

Definition of 'Wakeful'

From: GCIDE
  • Wakeful \Wake"ful\, a. Not sleeping; indisposed to sleep; watchful; vigilant. [1913 Webster]
  • Dissembling sleep, but wakeful with the fright. --Dryden. [1913 Webster] -- {Wake"ful*ly}, adv. -- {Wake"ful*ness}, n. [1913 Webster]