[guythedudebro]

If you can develop a robust system of testable explanations for the material reality of your dream world that hold consistently true where/when this is all happening then maybe your question would be useful.

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.