Years of our lives are passed in the dreamscapes of sleep, yet the phenomenon of dreams remains largely a mystery to us. We say 'it was only a dream' to dismiss these phantasms, and reassure ourselves that we have returned to reality. But recent research is blurring the distinction between sleeping and waking states. In the last ten years investigators have discovered that some 'lucid dreamers', can perform pre-arranged experiments in their sleep, and even send messages acfbss the sleep barrier to the waking world. The results of these experiments have provided startling insights into sleep consciousness. Everyman examines the story of lucid dream research, and encounters a puzzle well-known to the most ancient religious traditions: how can we ever be sure we're awake?