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wakeful

adjective
 
 
/ˈweɪk.fəl/ formal

Definition

not able to sleep, or used to describe a period of time when you are not able to sleep: We spent a wakeful night worrying about where he was. She lay there wakeful the whole night.Not sleeping and not unconscious wakefulness
 
 
/-nəs/ noun [U]
Not sleeping and not unconscious
(Definition of wakeful adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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