Hey, Welcome to DreamViews. Be sure to check out the wiki and it's helpful tutorials, in addition to the Beginner's Guide to Lucid Dreaming. I hope you receive more helpful input in that thread of yours regarding nightmares. I think mantras would definitely help. I think you could use these nightmares to your advantage in order to lucid dream; dream signs. Best of luck to you. Visit the chat room some time, eh.