Definitions of sleep:

• noun:   a natural and periodic state of rest during which consciousness of the world is suspended

  Example: "He didn't get enough sleep last night"

• noun:   a torpid state resembling sleep
• noun:   a period of time spent sleeping

  Example: "He felt better after a little sleep"

• noun:   euphemisms for death (based on an analogy between lying in a bed and in a tomb)

  Example: "They had to put their family pet to sleep"

• verb:   be able to accommodate for sleeping

  Example: "This tent sleeps six people"

• verb:   be asleep