On this week's show, Alok Jha discusses the science of sleep with Professor Russell Foster. What is sleep, why is it so important and how much do we need? How can you tell if you're not getting enough? Prof Foster is chairing this year's Cheltenham Science Festival, which will feature a study comparing the sleep patterns of Germans and Britons. If you want to tale part in this quick online survey, click here.Also in the show, the Guardian's environment correspondent John Vidal interviews Nobel prizewinning biologist Sir John Sulston. Sulston chaired the working group that prepared the Royal Society's recent report on global population levels People and the Planet. He discusses the impact on the planet of unchecked population growth and the importance of rebalancing consumption levels between rich and poor nations. Alok is joined by Observer science and technology editor Robin McKie and Guardian science correspondent Ian Sample to...
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