Channel 4’s documentary follows scores of children across Europe inflicted with narcolepsy, reports RadioTimes.

In early 2010, scores of children across Britain started to experience unusual symptoms. Although outwardly healthy, they suddenly began to lapse into uncontrollable sleep, sometimes nodding off up to 30 times a day. Their parents thought they were putting it on, or staying up too late, and only sought treatment after weeks had passed. Eventually, doctors got to the bottom of the problem – the children were suffering from narcolepsy.