Earlier quoted context omitted.
Not only that, but the fact that consuming a chemical can make your consciousness feel so different always felt to me like pretty good evidence that consciousness is material. I do think there are rational realizations that rational people can come to under the influence of psychedelics, that they might not otherwise, though.
I'm not sure I see why. Dreams tend to be unstable, but if a dream were particularly stable, and a certain behavior in the dream reliably triggered a certain insight (say, a dream sign that triggered lucidity), would that be evidence that consciousness was produced by the "material" in the dream? In the same way, if this is a dream of sorts, the fact that certain dream behaviors can trigger certain changes in experie…
There is complex physiology going on producing a consciousness (so it seems to me) that can be altered when that physiology is altered. We can see at least some of this physiology. Suggesting all that physiology in our world is actually happening in the dream world of some other being doesn't seem very interesting as it still leaves us here in the same material (as we can measure it) reality that science is... still pretty damn good at describing. So why even bring it up? If there's evidence that points us that way, cool, otherwise, Occam's razor seems better.