sleep·​less | \ ˈslēp-ləs How to pronounce sleepless (audio) \

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

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Other Words from sleepless

sleeplessly adverb
sleeplessness noun

Examples of sleepless in a Sentence

He lay sleepless in bed.

Recent Examples on the Web

Talitha Bateman and Lulu Wilson are orphan girls who come to live in a house where Annabelle’s taken up residence, which means a lot of sleepless nights for everyone involved. Brian Truitt, USA TODAY, "All 'The Conjuring' horror movies, ranked (including new 'Annabelle Comes Home')," 25 June 2019 It sure as heck is filled with a lot of emotion, schedule changes, financial changes and sleepless nights. Teresa M. Pelham,, "Kiss & Tell: She’s Still Not Divorced And Wonders Why Men She Dates Seem Less Understanding," 24 June 2019 Tucker is a struggling novelist who spends his sleepless nights toiling away in a secluded cabin in the woods and his days trying to prove he’s good enough for his beautiful fiancée. Samantha Highfill,, "Paul Wesley will return for Tell Me A Story season 2," 12 June 2019 After the hard work, and sleepless nights some times. Char Adams,, "Woman with Rare Bone Condition Graduates from College After Being Given 3 Days to Live at Birth," 12 June 2019 But one sleepless night, after four years of dating, Adam turned to me in bed. Mitchell Kuga, Condé Nast Traveler, "Writing My Love Story at the Strand, New York’s Most Iconic Bookstore," 3 June 2019 Suede slippers from Paris, bespoke facials to erase any and all signs of sleepless nights, and a keepsake bracelet that a mini-me (perhaps that’s you!) will one day inherit. Zoe Ruffner, Vogue, "6 Impossibly Chic Fashion Moms Share Their Dream Mother’s Day Gifts," 9 May 2019 Prescription painkillers were proving ineffective, leaving him sweaty and sleepless. The Economist, "Still not highDrugs policy in Germany is a mess," 1 Feb. 2018 Click to Read Story The Coaches Parents Call When the Baby Won’t Sleep After too many sleepless nights, exhausted moms and dads turn to experts, some of whom even offer overnight stays as part of the consultation. Sue Shellenbarger, WSJ, "Remember, It’s Their College Years, Not Yours," 16 Mar. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sleepless.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of sleepless

15th century, in the meaning defined at sense 1

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Statistics for sleepless

Last Updated

28 Jun 2019

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Time Traveler for sleepless

The first known use of sleepless was in the 15th century

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More Definitions for sleepless



English Language Learners Definition of sleepless

: without sleep
: not able to sleep


sleep·​less | \ ˈslē-pləs How to pronounce sleepless (audio) \

Medical Definition of sleepless

: not able to sleep : insomniac

Other Words from sleepless

sleeplessness noun

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Comments on sleepless

What made you want to look up sleepless? Please tell us where you read or heard it (including the quote, if possible).


something desired as essential

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