"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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