could (do something) in (one's) sleep

(redirected from could it something in my sleep)

could (do something) in (one's) sleep

Is able to do something with very little or no difficulty, or complete or accomplish something in a relaxed, carefree, or effortless manner. It took me a little while to get used to this job, but now I could do it in my sleep! You should ask Johnny for help—he could do this level of math in his sleep.
See also: could, sleep
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

someone could do something in their sleep

someone could do or accomplish something with no effort or conscious thought. informal
Farlex Partner Idioms Dictionary © Farlex 2017
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