Unit 11 Sleep

1. Unit 11 Sleep

2. Describe the following pictures

3. Think about these questions • Why do people want to sleep? • How do people sleep? • Have you ever heard of sleep cycle?

4. Two purposes of sleep • Physical rest (body rest) • Psychological rest (minds rest)

5. Two kinds of sleep • Passive sleep • Active sleep

6. Passive sleep (body rest) In passive sleep, the body is. The heart. We move very . And the brain becomes. This stage of sleep is known as because the brain waves move in a very slow, regular rhythm. at rest slows down little inactive slow-wave sleep

7. Active sleep (minds rest) The body several changes: the brain temperature rises, the amount of blood in the brain increases, the body becomes very, very still, and the brain goes from being very to being. The eyes begin to move rapidly. This is a sign---the person is. goes through inactive active dreaming

8. Sleep cycle Passive sleep active sleep Passive sleep active sleep

9. Language points • slow down When you reach crossroads, you should slow down your car. • be known as She is known as the pioneer of nursing. • go through They have gone through many dangers before they reached the North Pole.

10. Physical rest Passive sleep slow-wave sleep psychological rest Active sleep dreaming summary

11. Thank you!