Drinking more water before bedtime has benefits for normal people: First, increase the metabolism and discharge of toxins in the body. Drinking more water before bedtime can increase the blood flow to the kidneys and increase the amount of urine, thus increasing the discharge of toxins in the body. Second, reduce blood viscosity, drink more water before bed to increase blood flow, so that hyperlipidemia, atherosclerosis and other patients with reduced blood viscosity, to prevent heart disease, cerebral infarction and other diseases. Third, relieve constipation, if you have constipation and other diseases, drink more water can play the effect of lubricating the intestines, relieve constipation. If it is glomerulonephritis or renal failure patients, it is not easy to drink more water at this time, because drinking more water at night can aggravate edema, so that blood pressure increases, which is not conducive to the treatment of disease.