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Mock Mars trek finds down-to-Earth sleep woes

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WASHINGTON (AP) — Astronauts have a down-to-Earth problem that could be even worse on a long trip to Mars: They can't get enough sleep. And over time, the lack of slumber can turn intrepid space travelers into drowsy couch potatoes, a new study shows. In a novel experiment, six volunteers were confined in a cramped mock spaceship in Moscow to simulate a 17-month voyage. It made most of the...