Teenager who falls asleep anywhere baffles doctors

When Lois Wood started sleeping for long periods during the day - her mum thought it was just normal teenage behaviour. But the 14-year-old from Stevenage in Hertfordshire kept falling asleep at school and even at a basketball match.

Doctors though have not yet been able to diagnose what's wrong with her and it's caused her to take weeks off school while trying to study for her GCSEs.

Click below to watch a report from ITV News Anglia's Stuart Leithes: