Arm pain can not sleep, there may be the following reasons: first, shoulder disease, when the shoulder joint has rotator cuff tear or impingement syndrome of the acromion, there can be arm pain when sleeping, to carry out the MRI of the shoulder joint, X-ray examination, to carry out early diagnosis and early treatment. Second, cervical spondylosis, cervical spondylosis is serious, sleep can compress the nerves, and lead to serious pain in the arm while sleeping, which leads to poor sleep, the cervical spine of the X-ray film, CT, nuclear magnetic examination, for early diagnosis and treatment. Thirdly, myofasciitis, myofasciitis often starts with the pain on the inner side of the shoulder blade, which can be accompanied by numbness and weakness of the upper limbs on the same side, and it is necessary to carry out the relevant physical examination, as well as inspection, to exclude other diseases for diagnosis.