If the patient has a transient black haze in front of his eyes when he first wakes up, the following factors should be considered: First, the most common factor is upright hypotension, also known as postural hypotension, which is a common clinical condition in which the patient’s position changes with the change, but the blood pressure regulation is abnormal, commonly seen in the elderly in a state of clinicopathology when the arteries are gradually hardening, decreasing in elasticity and increasing in fragility. Secondly, it is also common that patients have taken certain drugs with side effects and adverse reactions, such as long-term use of antidepressants, vasodilators, diuretics, there are such side effects appear. Third, if the patient has dehydration caused by various factors, for example, if the patient has acute gastroenteritis leading to dehydration or heat stroke triggering dehydration, the above symptoms may also appear when he/she first wakes up. Fourthly, if the internal environment and the regulation of endostasis are weakened, such as chronic cardiac insufficiency, the patient will have the above clinical symptoms.