Dreaming is definitely something I've thought about in reference to this topic. I agree with your line of thinking that subconscious/dream state does has sensitivity to other things like higher dimensions.

I forget where I heard this paraphrased quote:
"It's not a matter of what is real or unreal, but rather what you are sensitive or tuned in to."

I'm a fan of viewing our subconscious/soul/dream state all being interconnected through quantum entanglement or collective sub(consciousness.)