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What Are Dreams?

Season 36, Episode 12 of 17

What are dreams and why do we have them? Are they a window into a hidden realm within us? Science is only just beginning to understand. NOVA joins the leading dream researchers and witnesses the extraordinary experiments they use to investigate the world of sleep. From human narcoleptics to sleepwalking cats, from recurrent nightmares to those who can't dream, each sequence contains a vital clue to the question these scientists are pursuing: why do we dream?

Previously Aired

Day
Time
Channel
11/24/2009
8 p.m.
11/25/2009
1 a.m.
11/27/2009
11 p.m.
11/28/2009
4 a.m.
12/16/2010
10 p.m.
12/17/2010
3 a.m.
6/29/2011
9 p.m.
6/30/2011
2 a.m.
8/11/2012
4 p.m.
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