And...back to normal.
I took him to the doctor this morning just to rule out ear infection (because it's so not like him to not sleep! He LOVES to sleep! He sleeps 15 1/2 hours per 24 hour period!) and of course, he was fine.
And we came home and took a 3 hour nap together. And then we read books and went for a walk and had a bath and he got all yawny and I fed him and put him in his crib awake and he went to sleep. Just like yesterday never happened!
Babies are so weird.