Professor Guy Leschziner is a neurologist based in London, and author of The Nocturnal Brain: Nightmares, Neuroscience and the Secret World of Sleep. He is a Professor of Neurology and Sleep medicine at the Institute of Psychiatry, Psychology and Neuroscience, King’s College London. He runs the Sleep Disorders Centre at Guy’s Hospital, one of Europe’s largest sleep services, specializing in narcolepsy, sleepwalking, seizures and other neurological disorders of sleep. He is also presenter of Mysteries of Sleep, on BBC Radio 4, and The Senses, for BBC World Service.