Vertigo is a subjective sensory disorder in which patients feel themselves or the outside world rotating or shaking, and the symptom can occur in several system disorders. The more common ones are vertigo caused by vestibular disorders such as otoliths, and some other cardiovascular and cerebrovascular diseases can also cause vertigo at night. 1. otoliths: at night, if the patient’s head position changes, a sudden onset of rotational vertigo or dizziness can occur, often accompanied by nystagmus, nausea, vomiting, etc., which lasts for a short time, mostly less than 1 minute. 2. hypotension: because of various aspects such as hormone level and neuromodulation influence, it will make the blood pressure lower at night than during the day, so for people who have a history of hypotension, they may have symptoms of vertigo because of further reduction of blood pressure; 3, cerebral hemorrhage: if there is a sudden cerebral hemorrhage at night, it can cause an increase in intracranial pressure and the hematoma can compress the surrounding brain tissue, resulting in impaired brain function, and vertigo will occur; 4, other: including Meniere’s disease, hypertension, heart valve disease, heart rate disorders, Myocardial ischemia, etc., may cause vertigo at night. If the symptoms persist, it is recommended to improve electrocardiogram, cardiac ultrasound and other examinations to clarify the diagnosis.