Why we can relax about sleep

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Feeling tired on your drive to work this morning? Frustrated by your early morning and late nights? A new study on sleep says even though you feel like you’re chronically sleep deprived, you might be getting more sleep than you think. Jim Horne of Loughborough University tells John and Adaora why we might be getting exactly as much sleep as we need. Guest: Professor Jim Horne of the Sleep Research Centre, Loughborough University, and author of "Sleepfaring: A Journey Through The Science Of Sleep"