# catathrenia

> English word · Noun

## Definitions
1. Groaning while falling asleep or while sleeping.

## Etymology
Catathrenia (from the Greek kata, meaning “below”, and threnia, meaning “to lament”)

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