Is there something I'm missing here? For the last 8 weeks C has been a very agreeable sleeper both day and night going down relatively easily.

For the past week I take him up for naps when he is showing his sleepy cues and he just fights and fights. I mean physically violently squirming in my arms and yelling so I lay him down and he screams, he won't take his pacifier at nap time anymore. He's screaming and going in and out of sleep while contorting his body in my arms. He's obviously tired but can't relax!! What is happening!?