Parasomnia is a nightmare dreamt by one and lived by 120,000 New Zealanders. It is a bizarre dimension where people can do amazing and terrifying things. Some play out extra-terrestrial invasions in their head. Others go for a drive. And one man, who knows nothing about art, turns the walls of his home into masterpieces. The one thing they all dream of, really dream of, is a good night's sleep.

Special report by 20/20 NZ

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