When patients vomit after staying up late, the following reasons are mainly considered: 1. After staying up late, the human brain cells are in a state of fatigue, which can easily lead to disorders in the patient’s nervous system, resulting in dizziness, nausea and vomiting. 2. After staying up late, patients may experience elevated blood pressure fluctuations, which can cause dizziness, headache and vomiting. 3. The company’s main business is to provide a wide range of products and services to the public.