# sleep tight

> English word · Phrase

## Definitions
1. If one keeps oneself tightly bundled one will sleep warm and rest well.

## Etymology
The word tight is sometimes explained as here meaning “well, soundly”. However, it can just as well be interpreted in its literal sense of “firm, fast”; compare fast asleep.

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