Wish wash

I managed to tidy the toy box whilst the boys napped today.
This little lot were rather grubby.
We've had two long nap today for us both over an hour, and the second one was at a respectable time as to not affect bedtime......

How wrong was I???!!!??!

Night number three of refusing to go to sleep (over 5 hours between nap and bed).
We had wide awake boys
Playing laughing joking boys
Obviously tired boys
Screaming crying boys
Then out of no where (2.5 hours after bed time) two zonked out boys.

I'm not sure what is affecting their sleep?!?
It's either developmental leap (both now walking) or the injections on Monday. I hope it passes soon :-(