Anyone who has even briefly suffered insomnia knows that the advice is to banish gadgets from the bedroom. There have been endless warnings about the disrupting effects of blue light, the neural problems caused by scrolling through web pages at 3am, and the psychological horror of allowing hard, unfiltered information to invade our cosy nests, when we should be sipping a milky drink and thinking about bunnies.
But research from the University of Glasgow this week found that teenagers are waking up in the night purely to check for new tweets and messages on social media, and this is turning them into classroom zombies. Many are averaging just five hours of disjointed sleep a night, and the pressure to be online constantly is leading to an anxiety epidemic, according to the study.
And, with further bad news for phone-obsessives, child health specialist Dr Aric Siegman, a fellow of the Royal Society of Medicine, has weighed in, pointing out that parents are often to blame for their children's phone habits, as they sit scrolling during dinner, Instagramming through family holidays, and tweeting instead of talking. The habit is contagious, he says, and now this learnt behaviour is beginning to affect teens' schoolwork and behaviour.
He recommends that two hours of screen-time a day is more than enough for teenagers, and he's right, of course. But while I agree that it's bad for their mental health, and sensible adults should be whisking smartphones from hands in one fluid movement, I'd be a hypocrite to try to get between my (22-year-old) son and his tablet - because I'm just as bad.
In fact, I have been addicted to my smartphone since the very first iPhone appeared. Of course, for my job as a journalist, I need to keep it with me, to check email, research facts and make phone calls. It's by my side wherever I go, and I depend on it to satiate my fear of missing out (FoMo) on interesting things. Call it PhoMo, if you will.