Wakeful definition

(1) 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"

(2) Marked by full consciousness or alertness

"Worked every moment of my waking hours"

(3) (of sleep) easily disturbed

"In a light doze"

"A light sleeper"

"A restless wakeful night"