When I am experiencing HI, I find it easiest to think. I am a programmer and most of my ideas come from thinking during a HI.

I have trouble remembering daily facts, and during school I use to rewrite all my notes until I remembered them all. Recently, during HI I switch my thoughts over to my school subjects, I start thinking of what happened during classes and my readings. Usually I lose focus of what I was trying to think of and my mind starts flowing by itself and then I slip into a nap or sleep, or, I just stay in this state for a long time. What is this called, is it a form of hypnagogia or something else? I have been looking around and cannot find the answer.

And if you are wondering, my marks and memory have increase dramatically with less studying by using this technique.