On the 22nd of May 1987 Kenneth Parks killed his mother-in-law and almost killed her husband. He claims he was asleep with amnesia for most of the event. The burden of proof is now on the defence. How can he prove that he was asleep? And if he can, does it mean he will walk free? In this episode of Bad People, Dr Julia Shaw and Sofie Hagen investigate how sleep scientists can examine our brainwaves to see whether we are conscious or awake. Can stress, anxiety, or sleep deprivation make us more likely to sleepwalk? What is the legal defence of “non-insane automatism”, and why is it so incredibly hard to argue in a courtroom?CREDITS Presenters: Dr Julia Shaw and Sofie Hagen Producer: Lauren Armstrong-Carter Editor: Anna Lacey Music: Matt ChandlerCommissioning Executive: Dylan Haskins Commissioning Assistant Producer: Adam Eland#BadPeople_BBC