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.

Learn More about in one's sleep

Share in one's sleep

Statistics for in one's sleep

Look-up Popularity

Comments on in one's sleep

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).

WORD OF THE DAY

exaggeratedly or childishly emotional

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!