Yes! Im so glad you posted this. Avett will be 3 mos on Friday and the last 3 nights has gone from a fairly good sleep w/ a clear routine to being completely out of control. He fights when we put him down, the only way I've gotten him to sleep the last few nights is either in his swing (with much battling) or else just next to me in bed (which is not my preferred place for him to sleep).
I have been going nuts trying to figure out what the hell happened, esp. considering I thought 3 mos was supposed to mark entry into better sleep, not worse sleep!
Maybe it is this growth spurt thing you mention. I hope he gets back to sleeping regularly - or better than regularly - soon!