How do body functions change in different phases of sleep?

Normal (physiological) sleep consists of two qualitatively different phases – slow and fast sleep. Slow sleep is characterized by a decrease in all the functions of the human body, the absence of dreams and rapid eye movements. However, in a state of slow deep sleep, a person can quickly wake up when exposed to stimuli important to him. Periodically, every 80-90 minutes, slow sleep is replaced by fast sleep, which is approximately 20% of the total sleep time.

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