In 2011, a six-man crew completed a more than 500 day-long simulation to determine the psychological effects of a potential trip to Mars. Now, a study has been published showing that the crew members slept poorly and became increasingly sedentary as the mission progressed. The would-be astronauts were each outfitted with devices on their wrists that measured both their movement and the light they were exposed to.

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500 days in a Mars simulation can really mess with your sleep

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