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Definition of sleep noun from the Oxford Advanced American Dictionary

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sleep

noun
/slip/ sleep pronunciation American
 
1 [uncountable] the natural state of rest in which your eyes are closed, your body is not active, and your mind is not consciousI need to get some sleep.I didn't get much sleep last night.Can you give me something to help me get to sleep (= start sleeping)?Go to sleep—it's late.He cried out in his sleep.Anxiety can be caused by lack of sleep.His talk nearly sent me to sleep (= it was boring).Try to go back to sleep.2 [singular] a period of sleepDid you have a good sleep?Ron fell into a deep sleep.I'll feel better after a good night's sleep (= a night when I sleep well).3 [uncountable] (informal) the substance that sometimes forms in the corners of your eyes after you have been sleepingTed rubbed the sleep from his eyes.IDIOMS

be able to do something in your sleep

(informal) to be able to do something very easily because you have done it many times beforeI haven't done many portraits, but I could paint landscapes in my sleep.be able to do in your sleep

go to sleep

(informal) if part of your body goes to sleep, you lose the sense of feeling in it, usually because it has been in the same position for too longMy foot went to sleep.go to sleep

not lose sleep/lose no sleep over something

to not worry much about something
It's not worth losing sleep over.not lose sleep no sleep overnot lose lose no sleep over

put someone to sleep

(informal) to make someone unconscious before an operation by using drugs (called an anesthetic)put to sleep

put something to sleep

to kill a sick or injured animal by giving it drugs so that it dies without pain. People say “put to sleep” to avoid saying “kill.”
put to sleep