Ben van der Velde joins Simon to judge suggestions by sleep expert Russell Foster and researcher Catherine Green. The panel discuss sleep, why you should clean your teeth in the dark and whether humans have a squirrelly ancestor.
Listen right to the end for a message from our friends at the Worst Foot Forward podcast!
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Our theme music was written and performed by Laurence Owen. Graphics by Theo Weedon, web design by Ian Bridgeman and support from the Wellcome Trust. The producer is Rachel Wheeley.