Video: What Are Dreams - Preview | Watch NOVA Online

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What Are Dreams - Preview

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Aired: 11/24/2009
00:30
Rating: NR

Find out what scientists know about dreams: what they are and why we have them. 8/22/2012

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What Are Dreams - Preview

Airs Wednesday, August 22, 2012 at 9:00 p.m. ET/PT. Check your local listings.

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