"wakeful" in the adjective sense
1. argus-eyed, open-eyed, vigilant, wakeful
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. light, wakeful
of sleep) easily disturbed
"in a light doze"
"a light sleeper"
"a restless wakeful night"
3. waking, wakeful
marked by full consciousness or alertness
"worked every moment of my waking hours"
Source: WordNet® (An amazing lexical database of English)
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