Last saturday night Laura and I screwed up Andy's bedtime routine. We were coming back from a family birthday party, and we left for the hour long drive home a little late. Of course, Andy slept in the car most of the way home. Then, after we got home, he was not at all about going to bed. Instead he jabbered to himself in his crib for a good hour and a half before finally getting upset and then falling asleep.
Now, Laura and I both understand that we're the luckiest parents ever when it comes to sleep. Usually we put Andy in his crib awake. He fusses for a few minutes. Then he finds (or remembers?) his thumb and falls happily asleep. Not so much these past two nights. Since we screwed everything up, we put Andy to bed and he screeches until we go in there and pick him up. This isn't the typical bedtime cry-it-out; he sounds legitimately unhappy.
We're starting to craft elaborate theories to explain this behavior: he's going through a developmental leap and the corresponding sleep regression, his routine isn't completely back to normal and he doesn't like it, his normal cry has actually changed to this new screeching cry, etc.
Whatever it is, I hope things settle back down soon. I liked it much better when he was easy to put to bed!