# semisomnia

> English word · Noun

## Definitions
1. A chronic state of low-grade exhaustion caused by too little or fitful sleep.

## Etymology
From Latin semi- (“half”) + somnus (“sleep”) + -ia. Compare with insomnia. Coined by British sleep expert Neil Stanley in 2007.

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