noun

insomniac

ihn-SOM-nee-ak

noun

A person who has trouble sleeping, especially on a regular basis.

"As an insomniac, he was used to being awake at 3am."

adjective

Relating to or suffering from insomnia.

"She spent her insomniac nights reading old paperbacks."

How to Use Insomniac

Learner’s notes

In plain EnglishSomeone who regularly struggles to sleep, or something related to that struggle.

insomniacs plural

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As an _____, he was used to being awake at 3am.

From insomnia + the noun/adjective suffix -ac.

zodiac cardiac Pontiac amnesiac brainiac egomaniac pyromaniac aphrodisiac kleptomaniac megalomaniac nymphomaniac hypochondriac