Lots of things to think about. Thanks. I stayed with him last night to see exactly what he does and he woke hysterical at one point. From being sound asleep to crying husterically. I think you might be right with the pain/discomfort.
He was diagnosed with reflux and put on Zantac when he was 2 months and Pead said to slowly take him off his medication which I did and he seemed fine for 2 weeks so I didn't really connect this sleep issue to reflux. I've put him back on his medicine to see if that makes a difference.
He also sees an Osteo for Plagiocephaly so he's pretty good in that regard.
He doesn't seem to stir awake or get restless. He's asleep and then he's crying.