By Sandee LaMotte, CNN Air, water, food — and some would argue sex — are key ingredients to human survival. In reality, there should be another “s” word in that list: sleep. We’re supposed to get between seven and 10 hours of sleep each night, depending on our age, but the US Centers for Disease Control and Prevention says that a third of Americans sleep fewer than seven hours a night. It’s a global problem too. “Sleep problems constitute a global epidemic that threatens health and quality of life for up to…
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