According to research, sleeping on your back may be associated with more nightmares and reduced dream recall. But there is a ton of individual variation, and some sleepers do report more vivid (and pleasant) dreams when sleeping on their backs.  Reality shifting is not the same thing as lucid dreaming; however, it involves sending your consciousness to another world. For this purpose, the starfish pose is ideal. If you are worried about nightmares, harness the protective power of black tourmaline.