Swine flu vaccine and narcolepsy

In 2009, hundreds of teenagers’ lives were changed forever, when a vaccine designed to protect them against swine flu appeared to trigger a sleep disorder. It affected people in various countries including Sweden. Maddy Savage speaks to Christopher Tyvi from Stockholm, who is one of those who experienced problems. A Bespoken Media production for BBC World Service. (Photo: Swine flu vaccine. Credit: Getty Images)