Longman Dictionary of Contemporary English homepage

sleepless

 adjective
     
sleep‧less
1

a sleepless night

a night when you are unable to sleep:
Adrian spent a sleepless night wondering what to do.
2 unable to sleep:
She lay sleepless for hours, worrying.
—sleeplessly adverb
—sleeplessness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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