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The stuff of nightmares - Horizon: Why Do We Dream? - BBC

Nightmares...fearsome, terrifying events that can fill you with dread. But can they be a good thing? One scientist thinks so as he explains that they are merely a rehearsal for dealing with real life events. Fascinating clip from the BBC Horizon programme Why Do We Dream? Watch more high quality videos on the BBC Worldwide YouTube channel here: http://www.youtube.com/bbcworldwide
Length: 02:35

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