Several danger signs of drowsiness are as follows: First, drowsiness should be considered whether there is a brainstem disease, such as thalamic infarction when the body is prone to drowsiness. Second, drowsiness should exclude episodic sleeping sickness, and whether the body has some diseases that cause the body to be in a state of hypoxemia. Insufficient oxygen supply to the brain at this time will also lead to drowsiness, such as respiratory diseases, cardiac macrovascular diseases, resulting in inadequate circulatory supply and reduced oxygen content, which will easily lead to drowsiness at this time. Third, drowsiness is usually the possibility of chronic disease aggravation, such as diabetes mellitus patients in poor blood glucose control, blood glucose levels rise, easily lead to diabetic ketosis, or hyperglycemia hypertonic state, this time the patient is also prone to drowsiness.