FILE - This Dec. 19, 2006 video file image provided by NASA TV shows Commander Michael Lopez-Alegria working aboard the International Space Station. 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. Lopez-Alegria, who holds the American record for longest space mission, said he could relate to the study findings. (AP Photo/NASA TV, File)

Associated Press
FILE - This Dec. 19, 2006 video file image provided by NASA TV shows Commander Michael Lopez-Alegria working aboard the International Space Station. 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. Lopez-Alegria, who holds the American record for longest space mission, said he could relate to the study findings. (AP Photo/NASA TV, File)
FILE - This Dec. 19, 2006 video file image provided by NASA TV shows Commander Michael Lopez-Alegria working aboard the International Space Station. 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. Lopez-Alegria, who holds the American record for longest space mission, said he could relate to the study findings. (AP Photo/NASA TV, File)
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