In this week’s Book Club podcast, Sam's guest is the novelist Samantha Harvey, whose new book — The Shapeless Unease: A Year of Not Sleeping — is an extraordinarily written, funny and terrifying account of her experience with insomnia. She talks to Sam about the strange contortions that the mind makes when the boundaries between conscious and unconscious thought start to fray, and how writing — as she sees it — saved her from madness.

The Book Club, what used to be known as Spectator Books, is a series of literary interviews and discussions on the latest releases in the world of publishing, from poetry through to physics. Presented by Sam Leith, The Spectator's Literary Editor. Hear past episodes here.