Definition of sleepless
1 : not able to sleep lay sleepless with fever
2 : affording no sleep sleepless nights
3 : unceasingly active or operative sleepless casinos
sleeplessly
adverbsleeplessness
nounFrom the M-W Editors
Examples of sleepless in a Sentence
He lay sleepless in bed.
15th Century
First Known Use of sleepless
15th century
SLEEPLESS Defined for English Language Learners
sleepless
playDefinition of sleepless for English Language Learners
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: without sleep
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: not able to sleep
Medical Dictionary
Learn More about sleepless
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Thesaurus: All synonyms and antonyms for sleepless Spanish Central: Translation of sleepless Nglish: Translation of sleepless for Spanish speakers Britannica English: Translation of sleepless for Arabic speakers
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