I experienced something from childhood to early adulthood that I really can't explain.
I remember, late at night, laying in bed. I'd hear the various noises around me. Somehow, I could make those noises sound louder. Doing this seemed to make the room I was in expand to a huge ize, and the blanket on me got thick and heavy-- almost too heavy to bear. This would go on for a while, and just fade away.
When I was younger, this scared the heck out of me: I hated when it happened. As I got older, and I realized that I wasn't being harmed, I got to enjoy it, and on occasions even induced it myself. It hasn't happened to me in decades.
I've basked various people about this, and was given answers ranging from sleep paralysis to a meditative state. Any comments?