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What working nights does to your health and the economy. Manuela Saragosa hears from Tracey Loscar, a paramedic in Alaska who works 24-hour shifts and sleep expert Professor Russell Foster of Oxford University, who tells us about the health effects. Marco Hafner, senior economist at the research institution Rand Europe, explains the impact on the economy of lost productivity. (Photo: An office worker on the night shift, Credit: Getty Images)