My son Gregory is 14. He does good most of the time. He doesn't have a BM in his pants any more but at night he tries so hard . He doesn't pee most nights. But some times he still pees himself. We have a plastic shower curtain down on his bed under his sheet and he wares adult pulluos and he has a hospital absorption matr on top of sheet. We get him up every 3 hours to go pee but sometimes it doesn't work. Any suggestions?