Thanks guys, those seem to echo what I went through.
I guess all anyone can say for sure, is that it's a real
alternate consciousness, but one where your cognitive abilities
are sharp and focused.
I haven't tried to "have" an experience. I thought what happened was cool as hell, but really have no interest in repeating it.
I did have a "kundalini" experience too, and that was a one time thing also, because the experience led to me not being able to relax like I could before doing TM meditation.
I anticipated it, and that ruined the TM. Kinda sucks, although
I might be able to try again now (it was in the 80's).