My money is on the molars too, Emma. Kind of feel like I'm posting this on everyone's thread atm, but so much of it sounds similar to what DD's going through, I just have to think all these kiddos that have been trained so well must have something going on!
Anyway, my main point was going to be, naps are always what gets hit hardest here when teething and on occasion nights are tough too. But, nights have really been not an issue as she's gotten older. So, it could be that's what's bothering him, but not enough to EW from it? Just a thought!