We will take 50% in Stage 2 sleep 20 percent in REM phase, 30 percent. In the other phase one sleep cycle takes 90-110 minutes. Normal people need to sleep 8 hours a day by sleeping in the morning wake up until dinner set. Elder sleep will change by sleep and wake up in the middle of the night, day added. The number of hours of sleep is not the same in each one, some people just sleep 5-6 hours per day, without drowsiness.
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