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Babies need a lot of sleep.
I can't get to sleep if there's any noise.
I woke up during the storm and couldn't get back to sleep.
A night without sleep left him red-eyed and haggard.
You need to go home and get some sleep.
Karen woke up from a long sleep and rubbed her eyes.
I haven't had a good night's sleep for over a week.
She lay down and soon fell into a deep sleep.
This is the American English definition of sleep. View British English definition of sleep.