I used to want to remember my dreams. I spent years collecting, analyzing and maintaining a deep interest in dreams. Then, I went off-and-on about them for a few years. Now, for some reason, all I have are nightmares. I have not had even a halfway pleasant dream for a very long time. I've tried dream incubation -- nothing. If I "give up" I keep having nightmares; if I try to manipulate the dreams, I have nightmares. I have even tried telling myself to "forget" my dreams. Nothing! My sleep is oppressive and vile. Any solutions?