The arm sleeping flat in the morning can’t move consider is sleeping posture is not suitable, soft tissue strain, shoulder joint periarthritis caused by the cause of the disease should be treated, the treatment method includes general treatment, drug treatment, physical therapy and so on. 1. Inappropriate sleeping posture: when you sleep, put your arm flat, if you don’t move or bend it all the time, you will have the symptom of stiff joints, and you can’t move your arm in the morning. This situation can be relieved by hot compresses and massage. 2. Soft tissue strain: if the arm for a long time strenuous excessive exercise, will lead to arm local muscles, ligaments and other soft tissue strain, if the night sleep cold, the morning may appear arm stiffness, can not move the situation. In this case, you can take medicines to activate blood circulation and remove blood stasis, such as Panax ginseng injury tablets and Yunnan Baiyao capsules. 3. Frozen shoulder: Frozen shoulder is a sterile inflammation of the soft tissues around the shoulder joint. Long-term lack of activity or exposure to cold will induce frozen shoulder, which will result in stiff shoulders and immobility of the arms. Attention should be paid to rest, and cold compresses can be applied to relieve symptoms during acute attacks, and drugs such as ibuprofen and indomethacin can be taken orally when the pain is obvious. The arm sleep flat in the morning to get up can not move there may be other reasons, such as degenerative arthritis, rheumatoid arthritis, etc., it is recommended to go to the hospital in a timely manner, clear causes for targeted treatment. The above drugs are recommended to be used under the guidance of a doctor.