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

     

    sleepless

     adjective
    adjective
    BrE BrE//ˈsliːpləs//
     
    ; NAmE NAmE//ˈsliːpləs//
     
     
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  1. 1[only before noun] without sleep I've had a few sleepless nights recently.
  2. 2[not before noun] not able to sleep She lay sleepless until dawn.
See the Oxford Advanced American Dictionary entry: sleepless