Why do we get nightmares?

18 July 2014
Presented by Chris Smith, Redi Tlhabi.

Are there extra types of water? Do plants give off carbon dioxide at night? Why does huddling together keep you warm? What is the origin of belly-button fluff? What causes nightmares? And how does the magnetic field around Earth affect us? Plus, news of how dental plaque can show us what our ancestors ate...

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