FILE - This Nov. 4, 2011 file photo released by Moscow's Institute for Medical and Biological Problems Russian shows researcher Sukhrob Kamolov greeting his relatives after completing a grueling 520-day simulation of a flight to Mars. 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 would-be spacemen act like birds and bears heading into winter, gearing for hibernation. (AP Photo/IMBP, Oleg Voloshin, Pool, File)

Associated Press
FILE - This Nov. 4, 2011 file photo released by Moscow's  Institute for Medical and Biological Problems Russian shows researcher Sukhrob Kamolov greeting his relatives after completing a grueling 520-day simulation of a flight to Mars. 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 would-be spacemen act like birds and bears heading into winter, gearing for hibernation. (AP Photo/IMBP, Oleg Voloshin, Pool, File)
FILE - This Nov. 4, 2011 file photo released by Moscow's Institute for Medical and Biological Problems Russian shows researcher Sukhrob Kamolov greeting his relatives after completing a grueling 520-day simulation of a flight to Mars. 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 would-be spacemen act like birds and bears heading into winter, gearing for hibernation. (AP Photo/IMBP, Oleg Voloshin, Pool, File)
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