My psychiatrist suggested that my problem could be caused by depression. I've had a lot of struggles my whole life, and I often feel life isn't worth living. My mind is always racing when I go to bed, and it's like my brain brings all my struggles up in my dreams. I can't remember what a good dream feels like anymore. My nightmares prevents me from getting deep sleep because it just won't calm down. It really does make sense to me. My psychiatrist has seen depressed patients with exactly the same problems. Hopefully anti-depressants work for me.