I wonder if I might be onto something - will have to wait til we've been through tonight to know for sure though...
I'm operating now on the assumption that there's a small amount of chronic OT lingering. I got DS up when he stirred during his nap yesterday and PD for bed earlier than we have for a while and he had a 12hr night instead of the 9.5-10hr nights we've been getting recently (still with a few wakings, but I suspect tonight might be better if we can get the nap right today).
His day yesterday looked like this:
6 - wake
11 - nap (fell asleep in the car)
12:45 - up (unhappy for a little while, then fine)
7 - asleep with no BT antics
woke at 7 this morning
The last few days have had 2.5-3hr naps and I've let him sleep because he was OT but he would then have a short night and need another long nap...