My son was prescibed morphine for a back injury. Now he will be up for three days at a time, then sleep for 24 hours straight. He also has developed sores al over his abdomin ,legs,arms and face. Basicially all over his body. He told me that his doctor said that this was all normal systems. I had read alot about symtoms and the only thing that I could find was that insomina could be one. No where did I see that body sores was one. He does have a history of drug abuse in the past where he would "shoot up". So I am wondering if maybe that could be a possiblilty?