Since his late teens, Louis Proud has suffered from chronic sleep paralysis and has undergone hundreds of such episodes, many of them terrifying but ultimately transformational and eye-opening. These experiences, he believes, allow access to the "spirit realm" and could well hold the key to a whole host of paranormal phenomena, including poltergeist disturbances, out-of-body-experiences, mediumship, spirit possession, and succubi and incubi encounters. Drawing on the work of Colin Wilson, Joe Fisher, Stan Gooch, Whitley Strieber, Robert Monroe, Dion Fortune, and a number of other paranormal...