Sleeping diagonally is due to the different sleeping habits of each person, which leads to different sleeping positions. Some people like to sleep in the lateral position, the body turned to the side, both lower limbs together while slightly flexed, take the right side of the sleep position is better, there is no pressure on the internal organs, is the most reasonable sleeping position, the left side of the sleep position on the heart has pressure. There is a prone position, that is, lying on his back, turning his head to the side, sleep on the internal organs have a sense of compression, poor heart function may cause serious consequences, fat is not suitable for taking this sleeping position, will increase abdominal pressure, affecting venous return. There is also a sleeping position is more common, is lying flat on the bed in the supine position, the face is facing up, there is no sense of pressure on the human organs, but it will affect the breathing, the pillow is too high, fat people deep sleep later will cause airway obstruction, respiratory distress syndrome.