People awake, pharyngeal tissue is tense, it will not block breathing; and to sleep later, some people relax or because of throat tissue hypertrophy, part of the airway obstruction, snoring occurs; if the airway is completely blocked , Air can not enter the lungs, can cause apnea. In the case of a serious shortage of oxygen, the brain will wake up to just a short body to tighten the throat of the degree of airway obstruction to lift, with a loud breathing, breathing returned to normal. So the cycle, breathing becomes shallow, fragmented sleep, so waking up the morning after the body tired. Over time, the body often hypoxia, lung, heart and other organs will be damaged.

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