M.
I have a 4 year old boy and am in the same situation. He was trained at 2 1/2 for daytime no problem but can't seem to stay dry when sleeping, even naps sometimes. I don't really have a solution except to say that some kids, if they are big for their age, can't control their bladder until around age 5. It has something to do with the fact that their bladder didn't grow at same rate as the rest of them and it takes that long to catch up. This is what a friend told me who had the same problem until her son turned 5. My son has always been off the growth charts like her son so I am hoping this will just "happen" when he gets closer to 5.