Meaning of “sleepless” in the English Dictionary

"sleepless" in British English

See all translations

sleeplessadjective [ before noun ]

uk /ˈsliːp.ləs/ us /ˈsliːp.ləs/

C1 without any sleep:

I've spent so many sleepless nights worrying about him.

[ after verb ] not able to sleep:

Alone and sleepless, she stared miserably 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

See all translations

sleeplessadjective [ not gradable ]

us /ˈslip·ləs/

without sleeping, or without being able to sleep:

I’ve spent so many sleepless nights worrying about him.

(Definition of “sleepless” from the Cambridge Academic Content Dictionary © Cambridge University Press)