We all know that too much time with tech is bad for the mind, but even resisting temptation is taking its toll on us, argues Tom Chatfield. Those phantom messages, where you imagine your phone vibrating – that’s your body trying to tell you something. Over half of us now suffer from nomophobia – anxiety of being out of phone contact – and our willpower and attention are suffering as a result

• Live This Book! by Tom Chatfield is published by Penguin