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In the third millennium BCE, Mesopotamian kings recorded and interpreted their dreams on wax tablets. And ever since, we've been on a quest to understand why we dream. And while we don't have definitive answers, we do have several theories. Amy Adkins shares the top seven reasons why we might dream. Lesson by Amy Adkins, animation by Clamanne Studio. Watch the full lesson at: https://ed.ted.com/lessons/why-do-we-...