What are the stages of sleep I

Rechtschaffen and Kales sleep staging, "in 1968" in the developed and the criteria are still used today. Accordingly, the normal sleep phase consists of 2 main sections and 5:

1) Non-REM sleep phases formed 4 education:

Stage I: 2-5% on All night's sleep, "it constitutes.

Stage II: Total sleep 45-55% "constitutes.

Stage III and IV: 20-25% of total sleep "constitutes.

sleep stage I and II, stage III and IV of the phases of deep sleep.

2) REM sleep, 20-25% of the total night's sleep, "it constitutes.

Glare provides physical rest in non-REM sleep. Secretion of growth hormone in children, adults, the cell renewal and repair was during this period. Drop in body temperature, heart rate and breathing rate decreases.

Non-REM stage I, stage of transition matching drowsiness. EEG "alpha waves also disappear. And vertex sharp theta activity occurs in the late period. Begins to decrease muscle tone and slow eye movements (SEM) is monitored. Non-REM stage II "in the cortical activity has slowed down even more. Theta waves, sleep spindles and K complexes, which together with the thread-specific shows. SEM thoroughly monitored and decreased muscle tone. The majority of the night's sleep, this stage is passed. Non-REM stage III "in the delta waves begin to form. During this period, much of the delta waves are 20-50% of the universe. Non-REM stage IV "in the delta waves, EEG," is also evident in 50% of the universe "accounted for more than. Eye movements are lost. However, SEM can be monitored from time to time. Muscle tone is reduced.

REM sleep, the stabilization of the membrane. This period is easy to arouse people. Dreams occur during this period. The autonomic nervous system is activated during this period because of the heart rate, respiratory rate, blood pressure rises and irregular. Sawtooth waves in the form of REM sleep occurs. Rapid eye movement (REM) is monitored. Muscle tone is completely lost.

Connected to the first REM sleep period to the end of the period called sleep cycles. Approximately 90-120 minute cycles throughout the night, this is 4-6 times again. In the first half of the number and duration of the night was dominated by non-REM REM sleep, weight gain in the second half.

In the end output, non-REM stage III-IV, growth and cell repair, REM plays a role in the process of memory and learning. Non-REM stage I and II "of the function is not fully understood yet.

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