Dreams -- Underlying Meta Structure

We know because we have several thousand years of historical information, and a couple hundred years of experimental experience with what the brain can do, and nothing has ever uncovered this sort of thing.

We also have some knowledge of what amount of processing power it takes to do this sort of thing from VR development work, and we have guesses as to the processing power of the brain, which is how are able to predict when computers will exceed the brain's power.

Proof? No way.

But just a wild guess? No.

But surely the brain plays some part in dreaming.