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WAKEFUL

Definition:

[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"
Synonyms: argus-eyed, open-eyed, vigilant, watchful
[adjective] (of sleep) easily disturbed; "in a light doze"; "a light sleeper"; "a restless wakeful night"
Synonyms: light