Definition of sleepiness noun from the Oxford Advanced Learner's Dictionary

     

    sleepiness

     noun
    noun
    BrE BrE//ˈsliːpinəs//
     
    ; NAmE NAmE//ˈsliːpinəs//
     
    [uncountable]
     
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  1. 1the feeling of needing sleep or being ready to go to sleep If you have excessive daytime sleepiness, consult your doctor.
  2. 2the quality of being quiet with nothing much happening The small town had an air of afternoon sleepiness.