Maybe the meme about only using 10% of the conscious brainpower is true
It's not. I had a dream about it and god told me it is a bullshit idea. Why would he evolve a brain and then not let you use it.
Okay seriously though.
The difference between mindstates is you don't evaluate things for quality when not awake. This is something cult leaders use. I studied quite a bit about brainwashing techniques. One of the methods used is to talk really really long. After you get more and more bored (and tired, in some cases), the critical part, the part that evaluates information to see if you agree, gets shut off a little (or completely). You become more suggestable. Everything, regardless of quality, becomes more acceptable.
As such people get indoctrinated into things like the moonies cult, scientology and other less fringe things people get brainwashed into.
Dreams, drugged states, but also various other ways where your mind is relaxed, less vigilant, you become open to ideas.
Openness to ideas is not inherently good or bad. It depends on context. It's probably not good while talking to a telemarketer, for example. If you're trying to write a new song it is essential. If you're the person judging which song is best, probably not so good. And so on.
That's what's going on. You experience these things just in a pure, almost childlike state. It sounds good.
But it only sounds good because you're not evaluating it critically and seeing that it is actually kind of gay.
I once woke up with a song in my head about how I wished I was an apple. Because as an apple I could score more goals.
This was a great song in my sleep.