In general, adults need eight hours of sleep a night. However, this amount in reality varies quite a bit from person to person.
By the time a person is full grown, their percentage of REM Sleep 
to total sleep has leveled out to about 20-25%. Adults with a low IQ (under 70),
or who are retarded, experience less REM sleep (1). This indicates that there
may be a connection between the amount of time one spends dreaming and their ability
to learn.
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Many adults will read in bed before falling asleep. Saying prayers is common,
as well as listening to music. In Peru, more adults read before going to bed than
watch TV, whereas more teens watch TV than read.
Adults who work night
shifts have unique sleep problems.
Parents will often stay awake to take care of chores that would have
been more difficult to do while the children were still awake. Parents often have
problems due to their children's bedtimes for sleep patterns.
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Read what parents have to say about
their children and sleep.
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page for parents.
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(1) "Dreams." Groliers Multimedia Encyclopedia. Apple Macintosh CDROM. Grolier, 1993.
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