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March 21 has been declared World Sleep Day, a time to recognize and celebrate the value of sleep. Many sleep experts hope it will be a wake-up call.

According to a poll (民意调查)by the National Sleep Foundation, nearly 4 in 5 Americans don’t get as much sleep as they should during the workweek. On average, adults are thought to need at least eight hours of sleep a night, although some can manage with less and some won’t do well without more. But the survey found that, on workdays, only 21% of Americans actually get a full eight hours of sleep, and another 21% get less than six.

To many of us, the thought of spending more time sleeping is, well, a big yawn. On the other hand, the thought of being smarter, thinner, healthier and more cheerful has a certain appeal. And those are just a few of the advantages that can be ours if we consistently get enough sleep, researchers say. Also on the plus side: We’re likely to have better skin, better memories, better judgment, and, oh, yes, longer lives.

“When you lose even one hour of sleep for any reason, it influences your performance the next day,” says Dr. Alon Avidan, director of the UCLA Sleep Disorders Center.

A study published last year found the same to be true even of children. When kids aged 8 to 12 slept for just one hour less for four nights, they didn’t function as well during the day.

But sleeping has an image problem. “We see napping or sleeping as lazy,” says Jennifer Vriend, a clinical psychologist in Ottawa, Canada, and the leading author of the study with children. “We put so much emphasis on diet, nutrition and exercise. Sleep is in the back seat.” In fact, she adds, no matter how much we work out, no matter how well we eat, we can’t be in top physical shape unless we also get plenty of sleep.

1.The underlined part in Paragraph 1 means _____.

A. To wake up the sleepers

B. To draw people’s attention

C. To serve as a morning call

D. To declare the special day

2.From Paragraph 3 we can infer that _______

A. Being healthier is one of the advantages for us

B. Sleeping has nothing to do with one’s expectations

C. Spending more time on sleeping is a waste of time

D. Enough sleep is the guarantee of the appealing things

3.What Jennifer Vriend said in the last paragraph implies that _______.

A. Sleeping is an image problem

B. People care little about sleeping

C. Lazy people tend to sleep long

D. Sleeping is only part of our life

4.What is the purpose of the passage?

A. To talk about people’s sleeping problems.

B. To provide an investigation result of sleeping.

C. To arouse the awareness of enough sleeping.

D. To stress the function of sleeping at night.

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