Sleeping to the right side of the body to the sky, may be related to benign positional vertigo, may also be due to cervical spondylosis, posterior circulation ischemia and other reasons. 1. Benign positional vertigo: If sleeping to the right side of the body, leading to a large change in the position of the head, it is likely to cause otoliths to fall to the semicircular canals, which will be manifested in the rotation of the sky, and may be accompanied by nausea, vomiting and other symptoms. 2. Cervical spondylosis: If there is a history of cervical spondylosis, especially in patients with cervical disc herniation, in the process of sleeping to the right side of the body, it is likely to change the position, resulting in the protruding cervical disc compression of local blood vessels, nerve roots, resulting in the vertebral arteries of insufficient blood supply, there may be a sense of torsion. 3. Posterior circulation ischemia: In the process of sleeping due to the slow blood flow, if the right side suddenly, for the existing vertebral basilar artery stenosis, posterior circulation ischemia of patients is likely to aggravate the ischemia of the brain tissue, induced brain dysfunction. Patients may show a sense of rotation, accompanied by head and face numbness, can not stand steady and other symptoms. Sleeping to the right side of the body rotation, but also may be a variety of factors, if the symptoms persist, should be as early as possible to seek medical attention, improve the relevant examination, diagnosis and then give targeted treatment.