Dreams are real; dreams exert influence

So the world ended.

And the next one began.

They were infinite.

They were the beginning and the ending; they were eternity.

You know why I really hated you? With all that you had you were just so oblivious to it all. You didn't use your beauty. You didn't ever try to get what you wanted. You didn't deserve what you had. I did because I would have used it. And you just...loved me. Loved me no matter what I did. You have no idea how I despised you for that. I wanted you gone."

'The Yielding

The dream is the exclusive property of the dreamer.

Infinite possibilities exist but we only focus on a small subset, filtering most of it out with our Beliefs.

It's part of the lore of being a chimney sweep.