Your senses.

I learned this from the impersonation of the devil possessing someone in Rec2.

Basically when you cut off one of your senses, you become involved in an entirely different world.

You can only see so much with the lights on, how about when the lights are off,

Things will be there that you didn't notice beforehand. Try it.

Only catch, you're not aware of your surroundings, so what's stopping anything supernatural?

Your mind swirls all over the place, giving personification and meaning to things when certain senses are blocked.

You're human, can't help it.

Only question

Which world Is REAL?

The world of 5 senses has been  tainted

So the more senses you lose, the more real your world becomes.

No one has tainted that one, and they won't.