Hiya, I would think with recent illness and teeth in the mix that could well explain things, and I'd be tempted to stick with usual routine until both of those things have passed. If you are still getting NWs when he is better I wonder whether you might do better with a set BT, rather than a set A time post nap? It's always worked better for mine that way - by making bedtime later when he naps longer you are kind of taking away the opportunity for catching up from him as any extra sleep he has taken at naptime (bear in mind sleep needs will vary a bit day to day) is taken a way from the start of his night. How about an 8.30pm set bedtime and see how it goes?