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Why do some of us do bizarre things in our sleep? Like riding a motorbike, using a shoe to phone for a pizza or even having sex while sleeping? These are complex behaviours and yet sleepwalkers aren't aware of what they're doing and often have no memory of their strange night-time activities. These sleep disorders are known as non-REM parasomnias and include conditions like night terrors and sleep eating. So why does it happen? In the first of a three-part series, neurologist, Dr Guy Leschziner, talks to patients he's been treating at his sleep clinic at Guy's and St Thomas' hospitals in London. They include Jackie who began sleepwalking as a child and continued her strange night-time behaviour as an adult, riding her motorbike whilst sleeping. We hear from James whose night terrors have become so violent his wife has begged him to get help; from Alex who rescues people from floods in his sleep. And we talk to Tom, whose recent diagnosis of sexsomnia has had a significant impact on his life. These remarkable sleepwalking experiences help us to understand the complex workings of the human brain. Producer: Sally Abrahams First broadcast on Â鶹Éç Radio 4 in December 2017.