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Definitions

insomniac

[in-som-nee-ak] / ɪnˈsɒm niˌæk /
ADJECTIVE
unsleeping
Synonyms
WEAK
alive astir attentive awake careful heedful insomnious observant on guard on the alert on the lookout on the qui vive sleepless vigilant waking wary watchful wide-awake
ADJECTIVE
wakeful
Synonyms
WEAK
alive astir attentive careful heedful insomnious observant on guard on the alert on the lookout on the qui vive sleepless unsleeping vigilant waking wary watchful wide-awake
Antonyms
WEAK
sleepy unaware

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“A Gift Before Dying” merges harsh realism, insomniac perceptions and tribal visions in a story that shocks and engages.

From The Wall Street Journal • Jan. 23, 2026

The neo-noir psychological drama stars Robert De Niro as Travis Bickle, a lonely, insomniac Vietnam War veteran who takes a job as a night-shift cabbie in New York City.

From Salon • Jan. 7, 2026

I also like to listen to lullaby music, which makes me sound like a fetus, but it helps me get over my insomniac tendencies.

From Los Angeles Times • Apr. 11, 2025

Get an insomniac friend to come over to your house and poke you with a stick.

From BBC • Nov. 14, 2024

What had I done, other than become an insomniac?

From "The Kite Runner" by Khaled Hosseini

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.