Men often sleep on their stomachs, have a great impact on the body. Sleeping on your stomach will cause insufficient blood oxygen saturation, because sleeping on your stomach will make the thoracic movement is limited, so it will lead to bronchodilator function is reduced, there will be chronic failure of respiratory function or chronic obstruction of respiratory function and other diseases, such as chronic obstructive pulmonary emphysema, chronic pulmonary heart disease, chronic pulmonary hypertension and so on. These conditions will make the arterial oxygen saturation is reduced, carbon dioxide partial pressure is too high, oxygen partial pressure is too low, thus affecting the function of ventilation and ventilation. Men often sleep on their backs, but also on the cardiovascular compression and obstruction, such as the coronary arteries of the heart, such as when sleeping on their backs, will produce pressure on them, and therefore will lead to spasm and contracture of the coronary arteries, thus causing the blood supply function.