Day

IN THE SUMMER OF 2010, Ben Blackwell, a five-year-old living near Dublin, Ireland, began complaining of headaches and a squealing noise in his head. And even though he’d stopped taking naps three years earlier, he now randomly fell asleep—while watching television, reading a book, sitting in the car. When Ben’s parents, James and Natalie, succeeded in rousing him, he often snarled at them and seemed terrified. But a