I am glad to see you recognize altered-state experiences are suspect, that aliens encountered during a drug trip could be constructs of a stoned mind. Just as dream visions are a product of the eureka effect. What ones mind focuses on becomes the theme of drug induced dream and any answers discovered there are derived from personal experience.
The mind, consciousness, is an amazing thing and the subconscious more so. It experiences all we do but without the attachment of ego. And it can develop solutions to life's problems without the constraints of personality. Unfortunately it must communicate through intuition, dreams and visions. And we interpret these to satisfy ego. Thus we believe our encounters with the subconscious to be supernatural when they are simply dream logic.
Sounds like you have a good handle on it, though. I and many others look forward to the 'Fingerprints' sequel.
I AM AN IMMORTAL, I LIVE FOREVER
i am anim(mort)al, i die today.
When gravity gets you down, brighten up and
Make light of the grave!