What's different about sleeping in space? Former NASA astronaut Mike Massimino breaks down all the differences between sleeping on Earth and sleeping in space. Is there a difference between sleeping upside down and sleeping right-side up? Do you get your own bedroom? What kind of alarm clock does an astronaut use?

Mike Massimino is a former NASA astronaut, senior advisor for space programs at the Intrepid Museum, and professor at Columbia University.

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