Definition of wakeful adjective from the Oxford Advanced American Dictionary

     

    wakeful

     adjective
    adjective
    NAmE//ˈweɪkfl//
     
    (formal)
     
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  1. 1not sleeping; unable to sleep synonym sleepless He lay wakeful all night.
  2. 2(of a period at night) spent with little or no sleep synonym sleepless She had spent many wakeful nights worrying about him.
wakefulness
 
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noun [uncountable] She began to drift between sleep and wakefulness. A sudden noise jolted him into wakefulness.
See the Oxford Advanced Learner's Dictionary entry: wakeful