Research by respected scientists has shown that America has about 8.4 million sleepwalkers and the UK has a little over 2.4 million. And somnambulists are known to have killed at least 70 people - with courts finding a huge percentage innocent of any crime. Few people suspected that 27-year-old Fraser, a loving and protective husband and father, was possessed by monsters which dominated him when he was asleep. These 'demons' goaded him into acts of savagery which culminated in the battering to death of his infant son Simon. Like other nightmare killers, a jury found him not guilty because he had been asleep at the time. Chief Inspector Robert Ledru of the Surete was a brilliant detective. In fact, his superiors in Paris rated him as possibly the most brilliant in France. He was also vain and arrogant until, that is, he realised he also suffered sleep problems and arrested himself for murder. Jo Ann, a Kentucky teenager in ankle socks goes on trial for her life after fighting an hour long gun battle with a burglar. Her father and little brother die in the shoot out. Twenty-four hours later she's charged with double murder. The intruder had existed only in her nightmare - and because of her sleepwalking her own shots had killed the people she loved. These are just three of the incredible cases explored in The Sleepwalk Killers - cases where nightmares are not just bad dreams and the violence very real.