A． Right B． Wrong C． Not mentionedMore than 1.1 million……
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Sleeping People who sleep for more
than eight hours a night do not live as long as those who sleep for six hours,
according to the biggest study yet into sleep patterns and mortality
(死亡率). Scientists have no explanation for the findings and do
not know if they mean people who like a lie-in (睡懒觉) can extend their lives by
sleeping less. Although it is a common belief that sleeping for
at least eight hours a night is vital for health and well-being, the six-year
study involving more than 1.1 million Americans older than 30 found that those
who slept for less than eight hours were far from doing themselves any long-term
harm. “Individuals who now average 6.5 hours of sleep a night
can be reassured that this is a safe amount of sleep. From a health standpoint,
there is no reason to sleep longer,” said Daniel Kripke, a professor of
psychiatry (精神病学) at the University of California, San Diego.
Dr. Kripke said, “We don’t know if long sleep periods lead to death.
Additional studies are needed to determine if setting your alarm clock earlier
will actually improve your health.” The scientists, who were
funded by the American Cancer Society, found that the best survival rates were
among the men and women who slept for seven hours a night. Those who slept for
eight hours were 12 per cent more likely to die during the six-year period of
the study, when other factors such as diet and smoking were taken into
account. Even those who spent a mere five hours a night in bed
lived longer than those who slept for eight or more hours. However, an
increasing death rate was found among those who slept for less than five
hours. Dr. Kripke said, “Previous sleep studies have indicated
that both short and long duration (持续时间) sleep had higher mortality rates.
However, none of those studies were large enough to distinguish the difference
between seven and eight hours a night, until
now.”
More than 1.1 million Americans participated in the six-year study.
