in one's sleep

idiom

Definition of in one's sleep

: done very easily due to having done the same thing many times before She could bake those cookies in her sleep. I can drive that route in my sleep.

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Cite this Entry

“In one's sleep.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20one%27s%20sleep. Accessed 26 Nov. 2020.

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