My almost 5 year old DS is still in nappies at night. He has been toilet trained during the day for almost 2 years.

I believe his body with learn control on its own as there is nothing I can do to help. After all, he is asleep so doesn't feel the usual sensations.

I just make sure he goes to the toilet immediately before bed and hope. So far, he has never had a dry night.

Maybe you can try the night pull-ups. They are like jocks/undies but more absorbent.

Otherwise, maybe you can wake him up about midnight for a toilet run.

GL