B

　　(2017·厦门质检)A recent research shows that the “short sleepers” had been more or less average in their sleep needs until the men were in their teens. But at the age of 15 or so, the men voluntarily began cutting down their nightly sleep time because of pressures from school, work, and other activities. These men tended to view their nightly periods of unconsciousness as interruptions in their daily routines.

　　In general, these “short sleepers” appeared ambitious, active, energetic, cheerful, and very sure about their career choices. They often held several jobs at once, or worked full­

　　or part­time while going to school. And many of them had a strong urge to appear “normal” or “acceptable” to their family, friends and so on.

　　When asked to recall their dreams, the “short sleepers” did poorly. More than this, they seemed to prefer not remembering.

　　In similar situation, their usual way of dealing with psychological problems was to deny that the problem existed, and then to keep busy in the hope that the trouble would go away.

　　The sleep patterns of the “short sleepers” were similar to, but less extreme than, sleep patterns shown by many mental patients.

　　The “long sleepers” were quite different indeed. The research shows that these young men had been lengthy sleeps since childhood. They seemed to enjoy their sleep, protected it, and were quite concerned when they were occasionally robbed of their desired 9 hours of nightly bed rest. They tended to recall their dreams much better than did the “short sleepers”．

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