Staying up late will overload the gastrointestinal tract, heart, brain and other organs, and long-term overload will cause certain damage to its internal structure and function. For example, staying up late can cause ischemia in the gastrointestinal tract and surrounding tissues, and long-term ischemia can lead to diseases such as gastric perforation, gastric ulcer and chronic gastritis in the gastrointestinal tract, and digestive, absorption and functional disorders in the gastrointestinal tract. Staying up late for a long time will keep the brain excited for a long time, leading to cerebral ischemia and hypoxia, dizziness, tinnitus, headache and other symptoms. Excessive ischemia and hypoxia will increase the probability of sudden death, and staying up late for a long time will increase blood pressure and accelerate the pace of cerebrovascular diseases. Staying up late will increase the load on the heart. In order to meet the needs of human body, the heart will increase the ejection capacity, accelerate blood circulation and increase the heart rate, which will lead to many heart diseases, such as premature ventricular beats, atrial fibrillation and premature ventricular beats.

Some people who sleep badly, especially those who sleep less than seven hours, are more likely to get fat. This is because lack of sleep can make the human body secrete more hormones, make people feel hungry and eat more, so it is easy to lead to obesity.