Definition of wakeful adjective from the Oxford Advanced Learner's Dictionary

     

    wakeful

     adjective
    adjective
    BrE BrE//ˈweɪkfl//
     
    ; NAmE 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.
See the Oxford Advanced American Dictionary entry: wakeful