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

What I did with mine: 1) I test drive this in his afternoon nap first since it's shorter. He goes nappy free for his afternoon naps. 2) I made sure that his evening diapers has been dry for consecutive nights. 3) I use a mattress protector. 4) I minimize his fluid intake in the evening. 5) I let him go to the potty before bed. It's a process but it works over time. Some may be ready and some may not be and there will still be accidents but I accept that as part of the journey.