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time REM (REM) and NREM (NREM) sleep

Figure 1: With age rapidly decreases the number of hours of sleep to be constant at about 6 hours.
Figure 2: With age, time in REM dream phase decreases rapidly when young and slowly as adults.
Figure 3: The percentage of time in stage 4 sleep decreases rapidly with age.

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At an early age, children more time to reach stage 4 of NREM and dream a lot. In young adults, the time in NREM stage 4 decreases significantly and wake up. In older adults, do not get to stage 4, wake up many times during the night and dream less.