What if the waist doesn't stick to the bed? Lie flat and don't stick to the bed. You can only raise your legs and feet above 45 degrees so as not to get tired. Stick your waist on the bed so that you won't get tired, or your waist will get tired. When sleeping on your back, the waist appears suspended and sour, mainly because the muscles of the waist are constantly in a state of fatigue, because when sleeping on your back, the muscles of the waist appear suspended and constantly in a state of tension. After a long time, local strain will occur, resulting in a feeling of local bitterness when muscles consume a lot of electrolytes, energy and nutrition, and metabolites such as lactic acid formed by long-term tension cannot be metabolized effectively in time, and the waist will also feel sour. Moreover, this situation is often combined with cold at night, because the local arterial blood supply is reduced after cold, so the nutrients such as energy and electrolyte will also be reduced. After the venous reflux slows down, lactic acid will further accumulate and aggravate the symptoms of acidity. Therefore, after this happens, you should keep your muscles relaxed and pay attention to the warmth of your waist. When lying on your back at night, it is best to put soft pillows on both knees and the back of thighs to keep your hips bent and knees bent, so that your waist will get better and your acidity symptoms will be obviously alleviated.