Question

After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the previous day.

The rest that you get while sleeping enables your body to prepare itself for the next day.

There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to the other.

Although your mind slows down，from time to time you will dream. Scientists who study sleep say that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.

If you have trouble falling asleep, some people recommend(推荐）breathing very

deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that the counting sheep will put you to sleep!

根据短文内容，回答下列问题。

36. How many levels of sleep are there?

37. What does the word “drowsy ”in the last paragraph mean in English?

38. What is REM?

39. How many suggestions are given if you can't fall saleep?

40. What is the best title of the passage?

Answer 1

36. There are four levels of sleep.

37. It means a little sleepy.

38. REM stands for rapid eye movement.

39. Three suggests are given if you can’t fall asleep.

40. The best title is “Sleep”.