Hey, happy belated birthday to Mr. W! Sorry to hear his brain is in overdrive in the wee hours. Maybe it is just nightmares, since he seems to be awake when you get to him... is that your feeling or do you think he has to be 'woken up' when you get to his room?
Does he remember things? Will he talk about it?
Speechie's description should be very helpful in figuring out which...

Sleep seems really fleeting around here, up until lately anyway, ds3 is finally sleeping well in her own room, and even going to bed with little fuss, so I am not expert. Dh was really the one to make that happen. I am a pushover for the cute kid standing by the bed at night (or just a pushover for sleep...)