Sleep is divided into two: Non-REM and REM sleep. Non-REM sleep also consists of three stages. Non-REM sleep comes first with Stage 1, which is a short-term transition phase and covers only 5 percent, and then comes Stage 2, where motor memory and information learned through movement and behavior are transferred to memory. Stage 2 accounts for 45-55 percent of sleep. In Stage 3, where deep sleep begins, the organism rests and renews itself. For a good rest, Stage 3 should constitute 20-25 percent of sleep.
The remaining 20-23 percent consists of REM sleep. During the REM period, where eye movements occur depending on the dream content, all muscles in the body are paralyzed. If the individual wakes up without regaining consciousness within that period, he feels like he will not be able to get up. The most important feature of this stage is that brain functions are as high as during wakefulness. Everything learned during the day is taken from the cache and archived and filed, just like the operating system on a computer. For example, a child studies during the day, looks like he hasn't learned anything, but sleeps. Cached information is saved while sleeping. When he wakes up, he realizes that he has learned the subjects he studied. Breathing is very irregular at this stage. An individual who goes through the REM period, in which the brain uses a lot of energy while all organs use the least amount of energy, wakes up in the morning fit and with increased learning capacity and skills.
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