NyxCC, I would agree the ear plugging could be his personal HH/WILD noise if it wasn't for the fact he says he's able to replicate it while awake. Maybe he has related these two (plugged ears and eye rolling) at a subconscious level or something? It seems to him that it's something physical, but again he doesn't know about HH or pretty much anything else, though he did recognize having felt it after I explained to him what it was.

I think I didn't express myself clearly with the eye rolling thing. It’s not anything like the typical REM eyeballs dance inside your eye sockets, he just looks up with his eyes closed and like looks for something far away, widening his field of vision. I didn’t give these details before because he didn’t himself explain them to me that clearly and I might have misunderstood him.

That’s basically what I wanted to ask about, whether we are onto something here, studying the methods of a natural, like the eye movements determining the sleep phase as you suggest.