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...Napping, and the need to nap, are universal. Abundant research – at the universities of Loughborough, Pennsylvania, California and many others – shows the immediate and pronounced benefits of even just 10 or 20 minutes sleep on a tired mind... In short it is rather odd that almost the whole world, and especially the cities where so many people spend their days, have not yet found a way to incorporate napping into the culture. — The Guardian