Fainting in the middle of the night with diarrhea, consider that it may be dehydration or electrolyte metabolism disorders, hypoglycemia and so on. If it is dehydration caused by sudden fainting should be timely rehydration and infusion, if it is low blood sugar should be timely glucose supplementation, and then for the cause of the treatment. Severe diarrhea, resulting in the loss of large amounts of water in the body, electrolyte disorders, there may be sudden fainting, timely rehydration, infusion, replenishment of water and electrolytes, to avoid fluid loss shock. Then according to the cause of treatment, if it is bacterial dysentery, you can use levofloxacin, norfloxacin and other drugs, sterilization and anti-infection. If the function of gastrointestinal tract is weakened, poor digestion and absorption of nutrients, frequent diarrhea, there may be hypoglycemia resulting in sudden fainting, first oral glucose solution, temporary relief of hypoglycemia. You can take montelukast, etc. to slow down gastrointestinal peristalsis and relieve diarrhea. You can also take probiotics such as lactobacillus and bifidobacterium to improve the balance of intestinal flora and promote digestion and absorption. Diarrhea may also cause electrolyte metabolic disorders, which can cause fainting and black haze and other manifestations. Sudden fainting in the middle of the night diarrhea may also be other reasons, the phenomenon should immediately seek medical attention to identify the cause, timely treatment, so as not to delay the condition.