i agree...people dont really control their bladder while they sleep so punishment is wrong..
My son went through the same thing. Finally, at age nine, we found a company that helps with this sleep disorder. Yes this can be a sleep disorder. Punishment and privilidges don't help. You can find out more about this on the web site: www.enuresiscontrolclinic.com It is quite expensive, but they let you pay it out. They train you to wake up when your bladder is full. Their work is guaranteed. I think it took a couple of months to be completely free of this problem.
Good luck and God bless.