Causes of dizziness during sleep: First, due to the slowing down of blood flow during sleep, the patient can experience ischemia of the posterior circulation, and the patient can be manifested as dizziness. Second, dizziness during sleep can also be clinically seen in benign positional vertigo, also known as otolithiasis, dizziness is more pronounced when the position changes, generally can be given to the patient manipulation reset for treatment. Third, dizziness during sleep can also be seen in some patients with cervical spondylosis. Due to the pressure on the vertebral artery caused by sleeping, the patient can appear dizziness, generally known as vertebral artery type of cervical spondylosis. Fourth, dizziness during sleep can also be caused by increased blood pressure, clinically, some patients’ blood pressure peak at night, due to increased blood pressure dizziness. Fifth, dizziness during sleep can also be considered to be caused by the heart, due to the vagus nerve excitation at night, heart disease is prone to aggravate the symptoms, usually patients can have arrhythmia or myocardial blood supply is not good.