I would take him back to the vet first. And, what I did with my puppy was to set my alarm and take him out about two to four hours, depending. Is he only peeing once during the night? Maybe you could set your alarm to wake you up four hours into the night. See if that works. Crate training is a good idea. I've heard people use newspaper inside, or those pee pads, if you don't wanna crate. I don't think bleach actually gets the odor out, but, I could be wrong.