My son is 41/2 years old. I have not been able to night train him. I finally put him back in pampers after trying underpants since he was three. At two he wore pullups to bed and was day trained. Still using tickets for refusing to listen and do as told, talking back and all kinds of agression. Progress slow here. How old should he be for night training alarm? What do you reccomend? Is there anything else I should try?