Professor Patrick McNamara has over 15 years of experience working directly on the problem of the nature and function of dreaming. He has been the recipient of grant awards from the National Institutes of Health, to further study sleep and was awarded the Ph.D. in Behavioral Neuroscience from Boston University. He did a Postdoctoral Fellowship at the Aphasia Research Center, Boston VA Medical Center. He has published over 50 scientific papers as well as several books on the neuroscience of dreams. We talk about the neuroscience and evolution of dreaming, but also about REM sleep, the function of nightmares, demonic possession dreams, sleep paralysis, lucid dreaming and dreams within dreams.