1. Although the dangers of too little
sleep are widely known, new research suggests that people who sleep too much may
also suffer the consequences. 2. Investigators at the
University of California in San Diego found that people who clock up 9 or 10
hours each weeknight appear to have more trouble falling and staying asleep, as
well as a number of other sleep problems, than people who sleep 8 hours a night.
People who slept only 7 hours each night also said they had more trouble falling
asleep and feeling refreshed after a night's sleep than 8-hour
sleepers. 3. These findings, which Dr. Daniel Kripke reported
in the journal Psychosomatic Medicine, demonstrate that people who want
to get a good night's rest may not need to set aside more than 8 hours a night.
He added that "it might be a good idea" for people who sleep more than 8 hours
each night to consider reducing the amount of time they spend in bed, but
cautioned that more research is needed to confirm this. 4.
Previous studies have shown the potential dangers of chronic shortages of
sleep—for instance, one report demonstrated that people who habitually sleep
less than 7 hours each night have a higher risk of dying within a fixed period
than people who sleep more. 5. For the current report, Kripke
reviewed the responses of 1,004 adults to sleep questionnaires, in which
participants indicated how much they slept during the week and whether they
experienced any sleep problems. Sleep problems included waking in the middle of
the night, arising early in the morning and being unable to fall back to sleep,
and having fatigue interfere with clay-to-day functioning. 6.
Kripke found that people who slept between 9 and 10 hours each night were more
likely to report experiencing each sleep problem than people who slept 8 hours.
In an interview, Kripke noted that long sleepers may struggle to get rest at
night simply because they spend too much time in bed. As evidence, he added that
one way to help insomnia is to spend less time in bed. "It stands to reason that
if a person spends too long a time in bed, then they'll spend a higher
percentage of time awake," he said. A．Kripke's Research
Tool B．Dangers of Habitual Shortages of Sleep
C．Criticism on Kripke's Report D．A Way of Overcoming
Insomnia E．Sleep Problems of Long and Short Sleepers
F．Classification of Sleep Problems
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Paragraph 2 ______.
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Paragraph 4 ______.
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Paragraph 5 ______.
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Paragraph 6 ______.
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A．fall asleep again
B．become more energetic the following day
C．sleep less than 7 hours
D．confirm those serious consequences
E．suffer sleep problems
F．sleep more than 8 hours
To get a good night's rest, people may not need to ______.
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Long sleepers are reported to be more likely to ______.
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One of the sleep problems is waking in the middle of the night, unable to ______.
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One survey showed that people who habitually ______ each night have a higher risk of dying.