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Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and t...

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is beneficial to people  disturbs people's life  makes people always restless  deprives people of a good sleep  
hard  his own  a day’s  good  
the sleeper's wishes  the sleeper's imagination  the sleeper's feeling  the sleeper's own mind  
His eyes begin to move.  His breathing becomes faster.  His heart rate increases.  His eyes stop movin  
Once  Twice  Four or five times  Forty times  
heavier  louder  stronger  happier  
hard   his own   aday’s   good  
REM Sleep  Two Types of Sleep  Sleepers  What Happens to Sleepers  
new ways of inducing sleep is still beyond man' s knowledge  consciousness is a crucial part in sleep research  the understanding of the purpose of sleep is still hard to achieve  we' ve got new insights into the consciousness  
During active sleep.  During deep sleep.  In the daytime.  In the early mornin  
keep sleepwalkers safe  prevent people from sleepwalking  avoid running into sleepwalkers  help people sleep well  
why we dream during sleep  how we dream during sleep  what dreams are  What benefits dreams bring to people  

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