<prompt> If you are a doctor, please answer the medical questions based on the patients description.most nights whilst Im asleep I put my hand on my head with my elbow in the air. I regularly wake up with a sore shoulder. I am continuously trying to keep my elbow at 90 degrees to my head to which I am constantly correcting. At first my wife and I found it very amusing as she described my elbow waving about in the air but it is starting to become an irritant...  <response>: Develop proper sleep posture. If you feel keeping hand under head you shoulder is sore then dont sleep like that sometime. Let the sore area heal. Pain and soreness is a body way to warn us that something is not right, and we need to slow down a bit. Also avoid heavy living from that upper limb, avoid sports and do normal range of motion exercise shoulder as tolerance. You will be fine in a month or so 