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Contrary to popular beliefs, people who sleep six to seven hours a night live longer, and those who sleep eight hours or more die 1 , according to the latest study ever conducted on the subject.The 2 , which tracked the sleeping habits of 1.1 million Americans for six years, 3 the advice of many sleep doctors who have long 4 that people get eight or nine hours of sleep every night.
“There's a(n) 5 idea that people should sleep eight hours a night, which has 6 scientific basis than the gold 7 of the rainbow,”said Daniel Kripke, a professor of psychiatry at the University of California at San Diego who led the study, published in a recent 8 of the Archives(档案)of General Psychiatry.“That's an old wives' tale.”
The study was not 9 to answer why sleeping longer may be 10 or whether people could extend their life span by sleeping 11 .
But Kripke said it was possible that people who slept longer 12 to suffer from short-term absence of sleeping, a condition where weaken breathing puts stress on the heart and 13 .He also speculated(推测)that the need for sleep was similar to 14 , where getting less than people want may be 15 for them.
The study quickly caused warnings and criticism(批评),with some 16 experts saying that the main problem in America's sleep habits was deprivation(剥夺),not sleeping too 17 .
“None of this says sleep 18 people,”said Daniel Buysse, a University of Pittsburgh psychiatrist.
“You should sleep as much as you need to feel 19 , alert and attentive the next day,”Buysse added,“I'm much more 20 about people shortchanging themselves on sleep than people sleeping too long.”
Sleeplessness produces a variety of health results that were not measured in the study, critics said.
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