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The demands of the working day and our 24-hour economy mean many of us don't get the recommended seven to eight hours sleep a night. Experts say all that sleep deprivation comes at an economic cost. Manuela Saragosa looks at the business case for sleep. Contributors: Danielle Marchant, Executive Coach. Matthew Walker, Professor of Neuroscience and Psychology at the University of California, Berkeley, and Founder and Director of the Center for Human Sleep Science. (Picture: A Sleepbox in Xian Province, China. Credit: Getty Images)