Inappropriate urination

My son is 11 yrs old and has been diagnosed with ADHD.  Since he has been 3-4, he has been urinating at night in inappropriate places ( heater vent, waste paper basket, plastic bag).  Just recently, we have found he has been urinating next to his desk in his room.  We have disciplined him for his actions by talking with him and taking things away.  I have read other forums.  He is very afraid of the dark and have a night light on for him.  Because of his ADHD medication, he does have trouble sleeping at night.  Any other suggestions would help.  We are going to bring this up with his pediatrician.

[nyychic]

My little brother used to do that and he didn't know what he was doing.  I would try to watch him and "catch him" doing this.  Maybe he is sort of sleep walking??  I don't know but it's possible.