Pee problem

Autumn

My son is 13 months old and weighs 22 pounds, and wears a size 3 huggies diaper.

Every morning he wakes up with wet shirts and pants that are damp with pee. I am not sure why, because during the day he doesn't have issues with size 3 huggie diapers whether or not it is pee or stool.

Anyone have this issue and how did you solve this.