# sound asleep

idiom

Source: https://englishreference.com/idiom/sound-asleep
Updated: 2026-08-10

## Meaning

Sleeping still and silently.

## Examples

- The baby is sound asleep in the crib.
- I tried to wake him for dinner, but he was sound asleep after his long flight.
- Despite the thunder shaking the windows, the exhausted traveler remained sound asleep throughout the entire night.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.