I haven't seen these,I'll check 'em out. I agree again,layers of reality is a good description. There are alot of good (non mainstream)reality theories out there that have broad enough explanatory power to address altered states of consciousness .Here are a few of my favorites:
Thomas Campbell's "My Big Toe"
The Way From Science to Soul - Integrating Physics, the Brain, and the Spiritual Journey
The Campaign for Philosophical Freedom