Director Rodney Ascher (Room 237) returns to Sundance this year with horror-docu hybrid ‘The Nightmare’, a film about sleep paralysis. Ascher himself has experienced the phenomena, in which sufferers report feeling paralyzed during the night, and being visited by dark and malevolent figures. The film recreates the experiences of sleepy paralysis sufferers in terrifying detail. The film is set to debut Monday at Midnight, ironically enough. You can view the Deadline Exclusive clip below.