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 For professionals, the Sabbath’s demise means barrages of emails to be answered during sleepless nights spent by the ghostly blue glow of the smartphone. Sohrab Ahmari, WSJ, "What We’ve Lost in Rejecting the Sabbath," 7 May 2021 Goldson spent two sleepless nights in June deciding whether to reopen county schools for in-person learning, at a time when the Trump White House was pushing to get students back in classrooms. Rachel Chason, Washington Post, "The county where Black women hold power — a few miles from the White House," 27 Apr. 2021 For Zaynab Abdi, seeing armed soldiers and military vehicles on the streets of the Twin Cities has brought back years of childhood trauma and a lot of sleepless nights. Faiza Mahamud, Star Tribune, "Among Minnesota's refugees, military presence in Twin Cities stirs painful memories," 22 Apr. 2021 At his lowest moment, amid the sleepless nights and trouble keeping food down, Jalen Hill didn’t want to leave his room. Ben Bolch, Los Angeles Times, "For UCLA’s Jalen Hill, a sport surrendered meant a crushing burden lifted," 10 Apr. 2021 To endure the sleepless nights in her Midtown apartment, Ms. Batan tinkered with a sculpture built from Legos in her living room, stacking pieces onto it until the morning. New York Times, "Martina Batan, New York Art Dealer Consumed by a Cold Case, Dies at 62," 9 Apr. 2021 If the past year or so has been one long slew of sleepless nights of tossing, turning, and turning over the pillow to the cool side again and again, welcome to the club. Greta Good, Chron, "Get the bamboo sheet set of your dreams for over 65% off," 24 Mar. 2021 There are so many things that give you sleepless nights. Emily Davies, Washington Post, "D.C.’s Lost Year: How the pandemic upended lives and businesses across a region," 16 Mar. 2021 Alex documented and shared his startup story: all the calls and conversations, all the cringy first pitches and sleepless nights filled with anxiety and self-doubt. Mary Juetten, Forbes, "Shifting To The CEO Seat: Casted," 11 Mar. 2021

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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Time Traveler for sleepless

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

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Statistics for sleepless

Last Updated

9 May 2021

Cite this Entry

“Sleepless.” Dictionary, Merriam-Webster, Accessed 17 May. 2021.

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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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