What does "insomniac" mean?

One who suffers an inability or difficulty sleeping; a sufferer from insomnia.

How do you pronounce "insomniac"?

Pronounced //ɪnˈsɒm.ni.æk//.

Insomniac

Q: What is a synonym for "insomniac"?

Common synonyms include: alertness, all-night vigil, consciousness, insomnia, insomnious, insomnolence.

//ɪnˈsɒm.ni.æk// adj, noun

adj, noun ·Uncommon ·Advanced level

Definitions

Noun

1
One who suffers an inability or difficulty sleeping; a sufferer from insomnia.
2
someone who cannot sleep wordnet

Adjective

1
Suffering from or pertaining to insomnia. not-comparable

Adjective

1
experiencing or accompanied by sleeplessness wordnet

Synonyms

All synonyms

alertness all-night vigil consciousness insomnia insomnious insomnolence

Example

More examples

"As he sits in the dark, typing away at his computer, he hears the sound of morning birds chirping away and realizes he has been up all night - but the insomniac still refuses to sleep."

Etymology

From insomnia + -ac.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.