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Less than seven to nine hours sleep and you're damaging not just your health but possibly the financial well being of your country. A new study, focusing on the UK, US, Canada, Germany and Japan, suggests that sleep deprivation could be costing countries billions of dollars in low productivity and missed days at work. Dr Neil Stanley is a sleep expert.

(Photo: A woman sleeps as she waits for a train in west London early in the morning. Credit: Daniel Leal-Olivas/AFP/Getty Images)