in·som·ni·ac
in-ˈsäm-nē-ˌak
: of, relating to, characterized by, or affected with insomnia
insomniac nights
insomniac tendencies
… he lived for several months with an older brother who didn't enforce bedtime rules. Joe started exchanging text messages with an insomniac friend and played online games against opponents on the other side of the planet.—John Cline
The last thing my sisters and I would do on Christmas Eve—before retiring to our separate rooms and our private paroxysms of insomniac anticipation—was make sure our parents had put out cookies for Santa Claus.—Christopher Caldwell
plural insomniacs
: a person affected with insomnia
Many insomniacs develop anxiety about going to bed and they fear sleeplessness, which can worsen insomnia.—Andrew Weil
Cite this Entry
“Insomniac.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insomniac. Accessed 8 Jul. 2026.
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