Someone who is wakeful finds it difficult to get to sleep and wakes up very often when they should be sleeping. + wakefulness wake·ful·ness It is never a good idea to take sleeping tablets regularly for this kind of wakefulness. a not sleeping or unable to sleep
(of sleep) easily disturbed; "in a light doze"; "a light sleeper"; "a restless wakeful night"
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"