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Meaning of “sleepless” in the English Dictionary

"sleepless" in British English

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sleeplessadjective [before noun]

uk   /ˈsliːp.ləs/  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   /ˈsliːp.ləs.nəs/  us   /ˈsliːp.ləs.nəs/
(Definition of sleepless from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sleepless" in American English

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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)
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“sleepless” in British English

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