The causes of dizziness, spinning and nausea while sleeping may be the following: 1. If the symptoms persist and the middle-aged or elderly have risk factors for cerebrovascular disease, they should be considered to be caused by serious diseases such as posterior circulation ischemia or infarction and hemorrhage in the cerebellum or brain stem. You should consult a hospital to improve the CT examination of the head to clarify the cause of the disease and then develop a reasonable treatment plan. 2. If dizziness, spinning and nausea are accompanied by tinnitus and stuffy ears, consider that it may be caused by Meniere’s disease, and use promethazine to control the symptoms of vertigo and give hormone treatment to reduce the edema of the inner ear. 3. If dizziness, spinning and nausea occur briefly when the position of the head changes, it is considered to be benign paroxysmal positional vertigo, which can be treated by repositioning.