# insomnia

> English word · Noun · IPA /ɪnˈsɒmniə/ · frequency rank #16,501

## Definitions
1. A sleeping disorder that is known for its symptoms of unrest and the inability to sleep.
2. Temporary inability to sleep.

## Etymology
Borrowed from Latin īnsomnia, from Latin in- (“without”) + somnus (“sleep”, noun) + -ia, equivalent to in- + somn- + -ia.

## Easily confused with
- **insomniac** (https://plainspell.com/en/vs/insomnia-vs-insomniac)
- **insignia** (https://plainspell.com/en/vs/insignia-vs-insomnia)

## Common misspellings (11)
`innsomnia`, `inosmnia`, `insmonia`, `insomina`, `insommnia`, `insomnai`, `insomnnia`, `insonmia`, `inssomnia`, `isnomnia`, `nisomnia`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/insomnia