Sleep - a state of rest of the body, which is accompanied by a decrease in the intensity of physiological processes: the excitability of the central nervous system decreases, consciousness is turned off, the muscles relax, heart activity and respiration slow down, blood pressure decreases. The frequency of sleep is associated with the daily rhythm of life.

Sleep in a person is caused by fatigue and overwork, which creates a need for rest and rest. When a person falls asleep, his connection with the outside world ceases, he partly loses his awareness of his own being, external objects and phenomena no longer act on him.

During sleep, nerves stop transmitting sensations to the brain. Of all the organs, the eyes are the first to get tired. Not all organs fall asleep at the same time: while some organs fall into a dream, the other, less tired, continues to cheer. Gradually, all the organs calm down and a deep and calm sleep sets in.. After several hours of such a dream, when the organs acquire sufficient strength and need a new work, and tired eyes continue to rest, certain well-remembered dreams often begin to appear, medicus. en.

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