wakeful (
http://definr.com/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]