The light of the morning can be a powerful ally when it comes to the evening and falling asleep. Also: special eye sensors that have nothing to do with vision, a master timekeeper in the brain that’s smaller than a grain of rice, and the hormone of night.
Guest: Dr Christine Blume, psychologist and sleep researcher at the Centre for Chronobiology in Basel, Switzerland.
Producer and Sound Design: Richard Ward Assistant Producer: Gulnar Mimaroglu Editor: Zoe Heron
A BBC Studios production for BBC Radio 4.