OP:"Non-dualism doesn't make any sense to the rational mind"

Well, someone seeing consciousness arising from matter (materialist monism/non-dual) isn't impelled to say anything like that. I mean, I'd view the forms of consciousness the OP describes (acid, meditation, hypnosis) as a being experiences where immediate language-generating mediation is suspended, "direct experience" but one shouldn't confuse those sort of sensations with an experience being beyond relation analysis. There are lots experiences where you can't think about what you're doing at the point you are doing it but you can certainly think before and after.