Definition of in one's sleep
- She could bake those cookies in her sleep.
- I can drive that route in my sleep.
: a state resembling sleep: such as
: a state of torpid inactivity
: to rest in a state of sleep
: to be in a state (as of quiescence or death) resembling sleep
: to have sexual relations
What made you want to look up in one's sleep? Please tell us where you read or heard it (including the quote, if possible).