wakeful

adj 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" [syn: {argus-eyed}, {open-eyed}, {vigilant},

{watchful}]

2: (of sleep) easily disturbed; "in a light doze"; "a light

sleeper"; "a restless wakeful night" [syn: {light}]