Princeton's WordNet

1. argus-eyed, open-eyed, vigilant, wakeful(adj)

   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(adj)

   (of sleep) easily disturbed

   "in a light doze"; "a light sleeper"; "a restless wakeful night"

3. waking, wakeful(adj)

   marked by full consciousness or alertness

   "worked every moment of my waking hours"

Wiktionary

1. wakeful(Adjective)

   awake rather than sleeping

2. wakeful(Adjective)

   sleepless

3. wakeful(Adjective)

   vigilant and alert; watchful

Webster Dictionary

1. Wakeful(adj)

   not sleeping; indisposed to sleep; watchful; vigilant

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