be able to do something in your sleep
成語所屬單字sleep
be able to do something in your sleep — 慣用語
1. to be so familiar with a task that you can do it without any effort or conscious
1.慣用語
釋義
閉著眼睛也能做；熟練到不行
to be so familiar with a task that you can do it without any effort or conscious thought.
例句
After twenty years of teaching, Mrs. Okonkwo could handle a noisy classroom in her sleep.
Michael has played that song so many times that he can perform it in his sleep.