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English definition of “sleepless”

sleepless

adjective [before noun]     /ˈsliːp.ləs/
C1 without any sleep: I've spent so many sleepless nights worrying about him.Not sleeping and not unconscious [after verb] not able to sleep: Alone and sleepless, she stared miserably up at the ceiling.Not sleeping and not unconscious sleeplessness     /-nəs/ noun [U]
(Definition of sleepless adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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