1. a natural and periodic state of rest during which consciousness of the world is suspended;
2. a torpid state resembling sleep
3. a period of time spent sleeping;
4. euphemisms for death (based on an analogy between lying in a bed and in a tomb);
1. be asleep
2. be able to accommodate for sleeping;
When I read this article, thoughts thronged my mind and I couldn't sleep.
I heard you talk in your sleep last night.
He passed on in his sleep.
A common superstition considered it bad luck to sleep in a room numbered 13.
You can't sleep out; anything might happen to you.
Nature seems to be wakened from a dead sleep.
I had a bad night; I went to bed early enough, but for some reason I couldn't get off to sleep.
This gas will put you to sleep during the operation.
The mother crooned her baby to sleep.
I think I'll go upstairs and have a sleep.
The convertible sofa means that the apartment can sleep four.
I'm sorry I'm so slow today, I didn't get much sleep last night.
You ought to lie in tomorrow and catch up on your sleep.
He lay in a drugged sleep.
The medicine will induce sleep.
Deep sleep came to him.
His mind was in such a turmoil that he couldn't get to sleep.
I yelled in my dream, which startled my roommate out of his sleep.
No one can do without sleep for very long.
I'm so tired that I could sleep for a week.
They have two maids who sleep in.
This medicine will ensure you a good night's sleep.
In his sleep he let the book fall out of his hand.
Her brain was befogged by lack of sleep.
a drug that disposes the patient towards sleep
Hush now and try to sleep.
Since 1991, parents have been advised not to put their infants down to sleep in the prone position.
He was nodding off to sleep in an armchair.
He awoke from his sleep in a cold sweat.
He mumbled some lame excuse about having gone to sleep.
one could do something in one's sleep
(informal)one regards something as so easy that it will require no effort or conscious thought to accomplish
she knew the music perfectly, could sing it in her sleep.
get to sleep
manage to fall asleep
go to sleep
let sleeping dogs lie
(proverb)avoid interfering in a situation that is currently causing no problems but may well do so as a result of such interference
put someone to sleep
make someone unconscious by using drugs, alcohol, or an anaesthetic
put something to sleep
kill an animal, especially an old or badly injured one, painlessly (used euphemistically)
sleep like a log (或 top)
sleep very soundly
sleep on it
(informal)delay making a decision on something until the following day so as to have more time to consider it
the sleep of the just
a deep, untroubled sleep
[usu. in imperative]sleep well (said to someone when parting from them at night)
sleep with one eye open
sleep very lightly, aware of what is happening around one
sleep, doze, nap, slumber
也认为睡眠是一种行为状态，特征为特有的不动姿势，对外界刺激的感觉降低但易恢复。睡眠分为两期，即非快眼动期((NREM sleep)和快眼动期(REM sleep)