sleep1S1W2 past tense and past participle slept [intransitive]
1HBHto rest your mind and body, usually at night when you are lying in bed with your eyes closed [↪ asleep, oversleep]COLLOCATIONS COLLOCATIONS sleep well/soundly sleep badly sleep peacefully sleep fitfullyliterary (=keep moving or waking during a sleep) can't sleep sleep late (=not get up until late in the morning) sleep like a loginformal (=sleep very well) not sleep a wink (=not sleep at all) somewhere/nowhere to sleep
if people sleep together, they have sex with each other
sleep with somebody
to have sex with someone, especially someone you are not married to:
Everybody in the office knows he's been sleeping with Kathy.
WORD CHOICE: WORD CHOICE: sleep, asleepYou usually use be asleeprather than 'be sleeping'• Her parents were already asleep (NOT already slept/were sleeping).The verb sleepis used when you are giving more information, for example about how long someone sleeps or where they sleep• The baby sleeps for 12 hours. • He slept in the car.You usually say fall asleep, not 'start sleeping'• Some students fall asleep (NOT start sleeping/start to sleep) at their desks.!! Do not say 'feel asleep'. You can also say someone goes to sleep, especially when they are in bed and want to sleep• I turned the light out and went to sleep.You use get to sleepwhen someone has difficulty falling asleep• It took me hours to get to sleep.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.