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  3. A full night’s sleep’/Not everyone needs it. The truism that all adults need at least eight hours of sleep a night for good heal

A full night’s sleep’/Not everyone needs it. The truism that all adults need at least eight hours of sleep a night for good heal

admin2010-05-25  45
问题      A full night’s sleep’/Not everyone needs it. The truism that all adults need at least eight hours of sleep a night for good health should be put to rest by mounting evidence that less may be better.①
     People who sleep about seven hours a night live the longest, three huge studies have found, the newest out in the February issue of the journal Sleep. Still, many sleep experts say lots of adults get too little rest, and that can lead to dangerous health problems.
     In the latest report from Japanese researchers, 104,010 adults were followed for about 10 years. At the start the participants answered questionnaires about their sleep patterns and about their health mental health and lifestyle habits, which also can affect survival. After accounting for all of these factors, adults getting all average of seven hours had the lowest death rates. Surprisingly, less sleep ,even as little as four hours a night, didn’t significantly increase deaths for men and only lowered survival for women if they averagde less than four hours② But adults who slept longer than seven hours, particulary women, were more likely to die during the 10 years.
     Two other major published studies and a dozen smaller ones came to similar conclusions, says psychiatrist Daniel Kripke, a sleep researcher at the University of California-San Diego School of Medicine. Doctors shouldn’t tell all of their patients to get at least eight hours of sleep, he says in an editorial in the journal. Hormonal changes triggered by darkness or other unknown biological effects from long sleep could be affecting survival,③ Kripke，says.
     But short sleepers may suffer other bad effects. In his brief studies, those sleeping four to five and a half hours did poorly on tests that measure memory, clear thinking and the ability to pay attention, "and they did progressively worse as the week went on," says David Dinges of the University of Pennsylvania School of Medicine. Adults who slept about seven hours performed best, he says. Other small studies have found adults who sleep less than six hours may be at higher risk for some diseases like diabetes and overweight. And sleep deprivation also causes car crashes, Dinges says. "People should get as many hours sleep, p as they need to feel rested," Kripke says, adding that there’s no proof that shortening sleep will lengthen life. s1eep need is partly genetic and may be determined by other factors that also influence life span, he says.
Sleep lack is harmful in many ways, EXCEPT that______
选项 A、it leads to diseases
B、people tend to be absent-minded
C、it affects social communication
D、it weakens analytical ability
答案C
解析 事实细节题。关于睡眠不足的危害在文章的第五段涉及。作者首先写到睡眠不足者会产生不良反应，接着具体阐述通过专家的研究得出的睡眠不足会造成哪些不良影响，包括影响思维、注意力、引起疾病、造成车祸等。而选项C 并没有在文中出现。
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