sleepless Definition in the Cambridge English Dictionary
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Definition of “sleepless” - English Dictionary

Definition of "sleepless" - American English Dictionary

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sleeplessadjective [not gradable]

 us   /ˈslip·ləs/
without ​sleeping, or without being ​able to ​sleep: I’ve ​spent so many sleepless ​nightsworrying about him.
(Definition of sleepless from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "sleepless" - British English Dictionary

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sleeplessadjective [before noun]

uk   us   /ˈsliːp.ləs/
C1 without any ​sleep: I've ​spent so many sleepless nightsworrying about him. [after verb] not ​able to ​sleep: Alone and sleepless, she ​staredmiserably up at the ​ceiling.
sleeplessness
noun [U] uk   us   /-nəs/
(Definition of sleepless from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “sleepless”
in Chinese (Simplified) 失眠的,不能成寐的, 失眠的,无法入睡的…
in Chinese (Traditional) 失眠的,不能成眠的, 失眠的,無法入睡的…
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