Depending what sort of day we have sat I will do a later bedtime, an hr I'd I can manage it so they go at 8.30 instead of 7.30 in the hope they will sleep later, unlikely they sleep an hr later but hopefully enough that I can just stick with their normal bt the next day new time which will be an hr later to them. Then I fix bt and they get used to it in a day or two. I don't have naps to worry about. If I put them down at 745 it is not enough to make them asleep later the next day at this age.