Lying prone or lying on the left side will bring great pressure to the heart, which may lead to poor breathing, backache and other discomfort after waking up. In general, the best sleeping position is lying on the right side, and the legs can be slightly flexed. Persisting in sleeping in this way is beneficial to the metabolism of the human body and the discharge of toxins, and the blood supply and oxygen supply functions of various parts are basically unaffected, especially for the liver and stomach, which can promote the digestion and absorption of food by the stomach, thus further producing the effect of losing weight.