Diarrhea and watery diarrhea at night may be caused by acute gastroenteritis, which can be treated by taking drugs such as levofloxacin and montelukast. People with acute gastroenteritis can experience abdominal pain, diarrhea, nausea and vomiting, mostly due to bacterial infections, unclean diet, overeating and other symptoms, can be treated by taking levofloxacin, and if the diarrhea and water pulling is particularly severe, can be treated by taking montelukast. Medications should be used under the direction of a doctor. During the treatment period, you should maintain a light diet, avoid overeating, avoid eating spicy and stimulating foods, such as barbecue, kebabs and other foods, you can eat some easily digestible fluids first, such as millet porridge and other foods.