verb

• (intransitive) To rest in a state of reduced consciousness.
  "You should sleep eight hours a day."
• (idiomatic, euphemistic) To have sexual intercourse (see sleep with).
  "Last night we slept together for the first time."
• (transitive) To accommodate in beds.
  "This caravan can sleep four people comfortably."
• (intransitive, idiomatic) To be careless, inattentive, or unconcerned; not to be vigilant; to live thoughtlessly.
  "We ſleep over our Happineſs, Great as it is, and want to be rous'd into a quick and thankful ſenſe of it, either by an actual Change of Circumſtances, or by a Compariſon of our Own caſe with that of other Men."

noun

• (uncountable) The state of reduced consciousness during which a human or animal rests in a daily rhythm.
  "I really need some sleep."
• (countable, informal) An act or instance of sleeping.
  "I’m just going to have a quick sleep."
• (informal, metonymic) A night.
  "There are only three sleeps till Christmas!"
• (uncountable) Rheum, crusty or gummy discharge found in the corner of the eyes after waking, whether real or a figurative objectification of sleep (in the sense of reduced consciousness).
  "When she had rubbed the sleep out of her eyes and wept till she was tired, she set out on her way and walked for many, many a day, till she at last came to a big mountain."