For the past couple weeks I have been smelling urine in my son's room. The first time I smelled it I just figured he had an accident and was too embarrassed to tell me. So, I asked him and he said yes. I told him that kids have accidents sometimes and just to let me know that way I can wash his sheets. I didn't think anything of it until a couple days later when I still smelled a strong urine smell. I asked him if he had another accident, and he said no. The sheets didn't smell bad or anything, but it was strong. I was in his closet yesterday and as I was walking out I stepped in something wet. I don't know why but something told me to check it out. It was pee. I talked to him about it, but he just says he doesn't know why he does it and that's all. He told me he won't do it anymore, but it seems really odd for him to do this. What are the possible causes for this type of behavior and should I be worried about something big going on or is this a normal stage that I'm unaware of?