On simulated Mars mission, sleep becomes crucial issue

Scientists study six astronauts in a faux spacecraft for 17 months. Most experienced some trouble sleeping — a problem that could be disastrous on a real mission.If humans ever journey to Mars, they will face an array of challenges: assault by cosmic rays, the erosion of bone mass and more subtle problems that could disrupt a mission's success. Now experiments from an audacious, 17-month-long simulation of a trip to Mars and back show that the ability to concentrate and work together may decay unless preventive steps are taken to maintain sleep quality.

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