Definition of “could do sth in your sleep” - English Dictionary

british dictionary

“could do sth in your sleep” in British English

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could do sth in your sleep

If you could do something in your sleep, you can do it very easily, usually because you have done it so often:

I've made this recipe so many times I could do it in my sleep now.

(Definition of “could do sth in your sleep” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)