Some people wander, get dressed, even eat in their sleep. Others lash out in violent ways. Is it possible that people can commit complex crimes-even murder-while walking in their sleep? With only a dead victim and a seemingly disoriented suspect at the scene of the crime, it's hard to know for sure. This program explores the question, following extensive sleep tests performed on accused murderers in a quest for truth and scientific clarity. But even if science bolsters the sleepwalking defense, could it actually work in a courtroom? More frighteningly, could sleepwalking become a legitimized pretense for murder?