Ahhhh, babies. We get in bed with producer Hannah Palin, and her husband, and her baby Dominic, as they all try to go to sleep. An intimate portrait of the effects of sleep deprivation. And then we try to understand what sleep is for by looking at what happens when ...

Looking into a mirror as a young child, Steven Johnson wondered, "How is that me?" We try to find that part of the brain that recognizes ones self with Montclair State University Professor Julian Keenan. Turns out: only half of your brain really knows who you are. Also, Independent radio producer Hannah Palin tells about her mother, who, after suffering an aneurism, woke up with a completely different personality. She looks the same, and has the same memories, but where did her old mother go? One possible answer: Vietnam. Later, Paul Broks continues the discussion on the fragility of the self.