Pregnant women with arm pain can not sleep may be physiological factors, calcium deficiency, chronic strain, cervical spondylosis and other factors. 1. Physiological factors: pregnant women in the daytime activities for a long time, and repeated activities of the arm, may make the arm local muscle lactic acid metabolite accumulation, in the sleep of the soreness can not fall asleep. 2. Calcium deficiency: in the process of pregnancy, with the gradual growth of the fetus, the absorption of calcium, may make the pregnant woman’s body lack of calcium, when the lack of calcium is more, it will cause arm pain, thus affecting the quality of sleep. 3. Chronic strain injury: the arm area for a long time in the cold, may lead to arm area myofascial damage, causing arm pain. In addition, at night when sleeping arm pressure or cold, will also lead to arm pain can not sleep. 4. Cervical spondylosis: pregnant women themselves have cervical spondylosis, sleeping at night in an unreasonable position, so that cervical spondylosis aggravation, severe compression of the nerves innervating the upper limbs, can also lead to arm pain, unable to sleep, may also be accompanied by neck and shoulder pain, numbness of the upper limbs and other symptoms. Pregnant women with arm pain can not sleep, and exclude physiological factors, it is recommended to consult a doctor for examination, clear causative factors and timely treatment.