Thanks UNCMomma. It is nice to know we're not alone, although I'd love to find a solution!
We worked really hard to get rid of the night feedings, which wasn't easy, so I don't want to go back to that if I can help it. I almost gave in last night when he was up for 3 hours, but I didn't really think he was hungry. I'm glad I didn't because even at his regular first feeding this morning he wasn't starving.
I always say he sleeps through when the conditions are optimal...not overtired, not sick, not teething, good day, etc. So, he CAN sleep through, but unfortunately not as often as I'd like!