Sleep frowning, may be a normal physiological phenomenon, may also be caused by the external environment, neurasthenia, organic diseases and other reasons. 1. Normal physiological phenomenon: sleep frowning, usually people’s usual state of life or living habits, which leads to the habitual state of the facial muscles. If you are too excited before going to bed, it can also lead to the appearance of sleep frowning. This is a normal physiological phenomenon, usually do not need special treatment. 2. External environment: If the environment around you is noisy and dry when you sleep, it is likely to affect the quality of sleep, which will easily lead to frowning. It is recommended to choose a comfortable, quiet, dark sleep environment. 3. Neurasthenia: If overwork, mental stress, always in a depressed and irritable mood, it is easy to lead to the patient’s brain plant nervous system dysfunction, symptoms of neurological weakness, which in turn affects the quality of sleep, resulting in frowning while sleeping. 4. Organic diseases: for example, cerebral atherosclerosis, migraine, encephalitis, Alzheimer’s disease, angina and other diseases, may lead to the patient in the sleep of the body uncomfortable performance, which causes frowning while sleeping. Sleep frowning can be caused by physiological and pathological factors, and if accompanied by uncomfortable symptoms, it is recommended to seek timely medical attention.