I mean no lifting, no going cold turkey, just letting them wear nappies until they could go all night and were subsequent children younger or older?
DS1 was 7 1/2 before we knew he would be dry every single night.
DD had 11 dry nights at about 5 but is now 6.5 and in pull ups at night.
DS2 is 4.7 and I haven't even tried anything though sometimes he thinks he can be dry.