Sleeping with both arms stretched upward is generally a normal and habitual action. In special cases, if there are symptoms such as pain and dizziness, they may be caused by diseases. 1. General: sleeping with both arms upward may be a habitual action, the process of stretching upward, the body’s shoulder joints, neck and other parts of the body can be fully stretched, helping to relieve the fatigue of the day, so that the body is fully relaxed. It has a lot to do with the individual’s sleeping habits and sleeping posture, and is not a manifestation of pathology, nor does it require special treatment. 2. Special circumstances: If certain symptoms appear in the process of stretching, it may suggest the existence of diseases, such as pain in the shoulder joint during the stretching process, activity limitation and other symptoms, may be due to frozen shoulder, subacromial impingement syndrome and other diseases; dizziness, discharge-like pain in the upper limbs, it may suggest the existence of cervical spondylosis. If the arm stretches upward during sleep with other symptoms, it is recommended to consult a doctor in time to clarify the cause and target treatment.