# one could do it in one's sleep

idiom

Source: https://englishreference.com/idiom/one-could-do-it-in-ones-sleep
Updated: 2026-08-10

## Meaning

Said of something that can be done very easily or effortlessly.

## Examples

- I have done this task so often I could do it in my sleep.
- After working as a mechanic for twenty years, he could do it in his sleep, even when the engine problems were complex.
- The veteran pianist played the intricate concerto with such effortless precision that it seemed she could do it in her sleep.

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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.