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STS090-E-5077
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STS090-E-5077

June 7, 2011
Astronaut Dafydd (Dave) R. Williams, a mission specialist representing the Canadian Space Agency (CSA), is a test subject for the Sleep Studies experiment in the Neurolab aboard the Earth-orbiting Space Shuttle Columbia. The sleep cap monitors and measures electrical impulses from the brain, muscles, eyes, and heart.