Could be that when he glazed over and stopped listening, he was meta-processing. That would be wonderful. I do a lot of watching us interact from time to time and sometimes get distracted (surprise, surprise ). I've figured out with important feedback from my H that at those times he sees I'm not listening my best and it bothers him so I try to tell him what is going on.
On the other hand, I gotta get out of his head and just figure out what gets the best results--it really doesn't matter what's behind those good results-it just matters to do what keeps them coming. 2L