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National Geographic has uploaded On the Set of Sleep | Brain Games Find out what it was like t...

National Geographic has uploaded On the Set of Sleep | Brain Games On the Set of Sleep | Brain Games National Geographic Find out what it was like to film a group of sleep study volunteers around the clock. THE BRAIN GAMES TWO-NIGHT EVENT PREMIERES SUNDAY 9/8c. © 2015 YouTube, LLC 901 Cherry Ave, San Bruno, CA 94066 You were sent this email because you chose to receive updates from National Geographic. If you don't want these updates anymore, you can unsubscribe here.