Can’t sleep? Perhaps you’re overtired

We’re used to seeing toddlers who can’t switch off at bedtime. But some experts think that our ‘always on’ lifestyles mean that many adults have the same problemNerina Ramlakhan remembers when her daughter was a toddler, and how if she got too tired she would be unable to switch off. “There was a healthy level of tiredness,” she says. “But if she went beyond that, she would be running on a kind of false energy. And then she wouldn’t be able to swit