Old farting at night with flatulence may be caused by eating too much at night, indigestion, slowing down of gastrointestinal peristalsis and so on. 1. Eating too much: If you eat too much or easy to produce gas food at night, such as soy foods, potatoes, onions, etc., it may cause too much gas to be produced in the intestines, leading to an increase in the amount of exhaust and the appearance of flatulence at night and old farts. 2. Indigestion: When you often eat too much greasy, spicy and other foods at dinner, it will increase the burden on the gastrointestinal tract, leading to indigestion and the appearance of nighttime bloating and farting. 3. Gastrointestinal peristalsis is slowed down: when the gastrointestinal peristalsis is slowed down, it will easily cause the food to stay in the intestines for a long time, leading to the gas produced by the bacterial fermentation, and the phenomenon of flatulence at night and old farts. Try not to eat before going to bed, and you need to have appropriate activities after meals. Chewing and swallowing slowly during meals can speed up the emptying of the stomach and reduce the phenomenon of bloating and old farts at night.