How do you introduce diaper-less during bedtime? My boy is currently 3yo and has been toilet trained for 6 months.

You can start out going diaperless on the weekends so even when accidents happen, you have time in the morning. To prevent unwanted messes, have your son sleep on top of a towel, layered with a piece of canvas or on top of a changing pad. As your son grows more confident, you can extend his diaperless nights to weekdays and eventually you can even get rid of the extra protective coverings on his bed.