SLEEPLESS Synonyms: 34 Similar and Opposite Words

sleepless

adjective

ˈslēp-ləs

Definition of sleepless

as in wakeful

not sleeping or able to sleep lay sleepless with worry

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Example Sentences

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Recent Examples of sleepless At first, the smell permeated the bedrooms, bringing with it sleepless nights. — Celina Tebor, CNN Money, 8 Aug. 2026 Like most expectant parents, Briana Faucette heard the typical warnings about sleepless nights. — Roni Robbins, AJC.com, 20 July 2026 No, special teams coach Dave Toub shouldn’t spend sleepless nights scheming up how to improve his team’s field-goal defense for next season. — Jesse Newell, New York Times, 15 July 2026 Today, there are no more bodies left to bury, but those sleepless nights remain. — Bo Evans, CBS News, 2 July 2026 See All Example Sentences for sleepless

Recent Examples of Synonyms for sleepless

Adjective

In a previous university blog post, Majumdar compared this finding to the brain flushing out byproducts that build up during active, wakeful moments, allowing for a more restful night’s sleep.

— Mack DeGeurin, Popular Science, 9 Sep. 2026
Low to medium doses show a reduction in the alpha frequency of brain waves (which correspond to relaxed and wakeful states), along with rising entropy, a signature finding of sober brains sinking deeper into a trip.

— Oshan Jarow, Vox, 4 Nov. 2024