Dizziness in bed, feeling spinning, can be caused by many reasons, first of all, it should be considered as dizziness caused by insufficient blood supply to the brain, in addition, it may also be related to cervical spondylosis, blood pressure abnormalities, otoliths and other factors. 1, insufficient blood supply to the brain: patients may have vascular sclerosis of the brain, so that a local blood supply to the brain is insufficient and functional disorders occur, manifested as dizziness, feeling spinning, especially poor sleep Poor quality of sleep, easy to induce the next day to wake up dizziness; 2, cervical spondylosis: especially vertebral artery cervical spondylosis and sympathetic cervical spondylosis, patients often get up in the morning suddenly appear dizzy, feel the phenomenon of spinning, but also may be accompanied by nausea and vomiting; 3, blood pressure abnormalities: patients with low blood pressure, easy to wake up postural hypotension, dizziness, feel the spinning. Patients with hypertension are prone to morning peak hypertension in the morning, which leads to dizziness and a feeling of spinning. 4. otoliths: when patients make normal postural changes, they may suddenly become dizzy and feel spinning, accompanied by nausea and vomiting, and in severe cases, they may even become deaf and have tinnitus, which usually lasts for several seconds. 5. It can last for half an hour or several hours, and can be accompanied by hearing loss and tinnitus.