Potty Training : nearly to full success

Alhamdulillah the half year potty training is coming to a full success soon. For half year he has been not on pampers during the day, however every time when he wants to do "projects" he would ask for pampers. Until yesterday, the pampers is too small to handle his projects and he finally agrees with me.
Now I just need to figure out how to survive the night without diapers.
Any suggestions anyone?