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Although the dangers of too little sleep are widely known, new research suggests that people who sleep too much may also suffer the consequences(后果).
Researchers at the University of California in San Diego found that people who sleep 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 in falling asleep and feeling refreshed（恢复体力）after a night’s sleep than 8-hour sleepers.
These findings, which Dr. Daniel Kriple reported in the journal Psychosomatic Medicine, shows that people who want to get a good night’s rest may not need to sleep more than 8 hours each 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 reminded that research is needed to prove this.
Previous studies have shown the hidden dangers of lack of sleep for a long time—for instance, one report showed that people who usually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
For the current report, Kripke reviewed the responses of 1,004 adults to sleep questionnaires (问卷), in which participants(参与者) 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, waking up early in the morning and being unable to fall back to sleep, and feeling tired with day-to-day functioning（运转）.
Kripke found that people who slept between 9 and 10 hours each night most probably report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that longer 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 deal with insomnia（失眠）is to spend less time in bed. “It means that if a person spends too long a time in bed, then they’ll spend a higher percentage of time awake,” he said.
| Title | Sleeping too 81 －Not a good thing. |
| Introduction | Although the dangers of too little sleep are known, new research suggests people who 82 may suffer the consequences. |
| Findings | ● People wanting a good night’s rest needn’t sleep more than 8 hours each night. ● People sleeping over 8 hours are 83 to reduce the time in bed. ● People sleeping between 9 and 10 hours are more 84 to experience each sleep problem. ● People sleeping 85 may struggle to get rest at night. |
| Studies | Previous studies have shown one hidden danger of shortages of sleeps: shorter sleepers may risk their 86 . |
| Report | According to the current report, the participants interviewed indicated their sleeping problems as: waking at midnight, __87__up too early and 88 to fall back asleep. |
| 89 | One way to 90 insomnia is to spend less time in bed. |