Chris Hadfield can walk in space, fly a plane, write books and perform David Bowie songs in microgravity. But when he was a kid, he couldn’t sleep. In The Darkest Dark, his semi-autobiographical children’s book, Chris details his crippling fear of the dark, which presented itself during night-times at his family cottage on Stag Island, near Sarnia, Ontario. Watch Chris talk about the book’s inspiration: