That's interesting, tink. We've been getting 10hr nights even on 1hr naps too. I was wondering how/ when no naps days might start and if J isn't OT I was thinking of trying to cap his nap further. I let him nap as long as he wants today (1hr 20), and we're doing an ebt tonight in case he is OT as he's not going to get much sleep over the weekend. I'm hoping it is that, otherwise we're going to have a hideous night.
Even if it's all developmental, it tends to disrupt his sleep more if he's UT than if he's properly tired. It's often the difference between waking, rolling over and going back to sleep, and being awake for 2hrs.... So if he's UT going to bed tonight it could all go wrong at 3am. At least I'll know where I am then, though!