1
: not able to sleep
lay sleepless with fever
2
: affording no sleep
sleepless nights
3
: unceasingly active or operative
sleepless casinos
sleeplessly
adverb
sleeplessness
noun
Examples of sleepless in a Sentence
He lay sleepless in bed.
Recent Examples on the Web
And one lively female was virtually sleepless, averaging just four minutes of sleep each day.
—
Amber Jorgenson, Discover Magazine, 20 Feb. 2019
Practical and Cute Enter the perfect solution to her sleepless nights.
—Amanda Garrity, Good Housekeeping, 25 Jan. 2023
See all Example Sentences for sleepless 
Amber Jorgenson, Discover Magazine, 20 Feb. 2019
Practical and Cute Enter the perfect solution to her sleepless nights.
—Amanda Garrity, Good Housekeeping, 25 Jan. 2023
See all Example Sentences for sleepless
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'sleepless.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Sleepless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sleepless. Accessed 29 May. 2024.
Copy CitationKids Definition
sleepless
adjective
sleep·less
ˈslē-pləs 
1
: not able to sleep
2
: marked by the absence of sleep
a sleepless night
3
: unceasingly alert or active
sleeplessly
adverb
sleeplessness
noun
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