S.S.
Sounds to me like you have tried things. My son is 3 1/2 and I thought that he would never get potty trained. He has been potty trained for several months now and night trained for about 3-4 months. I dont know what the answer is but I think that in time, it just happens. My nephews wore pull ups to bed until last year and they are 7 and 8. So the night time thing is really hard. My son has a really strong bladder. He can hold it more then me. Each child is different and they all go at their own pace. It makes it hard to do a sleep over but just remember he is not the only one. Good Luck!