Old people like to talk in their sleep may have the following reasons: 1, excessive psychological pressure to produce anxiety, depression, many elderly people will be due to family changes or environmental changes and cause tension, irritability, pessimism and other negative emotions, over time, easy to produce anxiety and depression. In addition to memory loss, patients with Alzheimer’s disease in the middle and late stages may also show obvious mental symptoms and behavioral abnormalities, including dreaming, babbling, hallucinations, delusions, and even sleepwalking. Patients with cerebrovascular disease, Parkinson’s disease, Lewy body dementia, fast-acting sleep behavior disorder, and encephalitis sequelae may also experience frequent sleep talking.