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A full night’s sleep’/Not everyone needs it. The truism that all adults nee
A full night’s sleep’/Not everyone needs it. The truism that all adults nee
游客
2024-10-22
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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. [br] What can we learn from the passage?
选项
A、Sleep hours is the most important factor affecting survival.
B、Going to bed and getting up early improve health.
C、Less sleep is more harmful than over sufficient sleep to people.
D、People have different demands of sleep hours.
答案
D
解析
推理判断题。文中提到了睡眠时间与生命长短的关系,但并没有表明睡眠时间是最重要的因素,因此可排除选项EA);选项B 虽然是我们的常识,但是在文章中并没有提到;根据文章最后一段最后两句可知不同的人会有不同的睡眠需求,选项D 正确;选项C 与原文相反,可排除。
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