Ursula K. Le Guin’s The Lathe of Heaven is an awesome bit of science fiction. There’s a man named Orr who sometimes changes reality in his dreams. No one else knows that anything has happened, but the guilt over the responsibility of shifting reality is too much for him, so he does too many drugs to stop sleeping, is caught and put into therapy. This is in the first few chapters. Then it gets interesting.
His therapist has a machine that makes Orr’s dreaming more regularized and controllable and then starts using him to radically reshape the world to better fit his idea of what would be better.
It’s an amazing Dickian conceit but less madly written. I don’t know how I’ve missed reading this for so long. I found a trove of Le Guin paperbacks at a recent used book sale so I’m hoping to find a few more such gems in the heap (and am not reading anything about any of them ahead of time).