The ground was so far below him, he could barely make it out through the grey mists that whirled around him, but he could feel how fast he was falling, and he knew what was waiting for him down there. Even in dreams, you could not fall forever. He would wake up in the instant before he hit the ground, he knew. You always woke in the instant before you hit the ground.
—George R. R. Martin, A Game of Thrones