In January of 1997, an otherwise nonviolent man under great stress at work brutally murdered his wife in their backyard. He then went back to bed, awakening only when police entered his home. He claimed to have no memory of the event because, while his body was awake at the time, his mind was not. He had been sleepwalking. In The Twenty-four Hour Mind, sleep scientist Rosalind Cartwright brings together decades of research into the bizarre...