Definition of wakeful (adjective)
- carefully observant or attentive; on the lookout for possible danger
- (of sleep) easily disturbed
- "in a light doze"; "a light sleeper"; "a restless wakeful night"
- synonyms: light
- marked by full consciousness or alertness
- "worked every moment of my waking hours"
- synonyms: waking
Source: Princeton University Wordnet