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(肌肉) 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 tell us that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This period of sleep is called REM, which stands for rapid eye movement.
If you can’t fall asleep, some people recommend breathing very slowly and very deeply. Other people believed that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep!
【小题1】The word “drowsy” in the last paragraph means _________.| A．sick | B．stand up | C．awake | D．a little sleepy |
| A．dream more often | B．have poor health | C．nervous | D．breathe quickly |
| A．your eyes move quickly | B．you dream |
| C．you are restless | D．both A and B |
| A．approximately six hours | B．around ten hours |
| C．about eight hours | D．not stated here |
