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Definitions

insomnia

[in-som-nee-uh] / ɪnˈsɒm ni ə /
NOUN
inability to sleep soundly
Synonyms
STRONGEST
restlessness
STRONG
indisposition sleeplessness stress tension vigil vigilance wakefulness
WEAK
insomnolence
Antonyms
STRONG
relaxation
WEAK
sleep

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.

Online marketing claims these peptides help with, among other things, weight loss, muscle-building, anti-aging, insomnia, tissue repair and sexual dysfunction.

From Salon • Apr. 4, 2026

I finally fell asleep at 5:30 a.m. after considering going to the hospital at least twice for insomnia and heart palpitations.

From The Wall Street Journal • Mar. 17, 2026

Doctors usually diagnose and treat insomnia and obstructive sleep apnea as separate disorders.

From Science Daily • Mar. 1, 2026

Feeling scared and suffering with insomnia, Fearon retired from all sport.

From BBC • Feb. 14, 2026

I hate this, hate insomnia more than anything, just lying there, brain going round, tick, tick, tick, tick.

From "The Girl on the Train" by Paula Hawkins