Do you have trouble sleeping? How do you overcome the sleeping problem?
2. reading comprehension
How much do we know about sleep? What do scientists study about sleep? What are REM and NREM? (P1-3)
Why do we have dreams? How do we feel after horrible dreams? What can we benefit from having dreams? (P4-5)
During sleep, when do nightmares usually occur? How can people control their dreams? (P6-7)
What problems may happen for some people during their sleep? (P8-10)
How many hours of sleep are needed for average peopel each day? What can people do to combat sleeping problems? How much time would people spend sleeping in their whole life? (P11-14)
3. Usage and grammar
Each period of dreaming is a little longer, the final one lasting up to an hour. (lines 37-38)
They usually grow out of it by the time they become adolescents. (lines 46-47)
Children do not remember that they were walking in their sleep, ... (line48)
People snore because they have trouble beathing ... (line 57)
They stop breathing up to thirty or forty times an hour ... (line 59)
..., or you may get so interested that you will not want to go to sleep ... (lines 87-88)
4. Collocations
average person (line 1)
..., dreams can have positive effects on our lives. (line 30)
... the brain may concentrate on a problem ... (line 31)
fall asleep (line line 37)
... changing the negative stories or thoughts into positive ones on paper. (line lines 43-44)
Some people have a habit of grinding their teeth ... (line 51)
..., there will be permanent brain damage. (lines 63-64)