It’s probably all too familiar. Against your best intentions, you find yourself reaching for a late-night snack again. You snap at a colleague who didn’t really say anything wrong. You find excuses so that your daily run becomes a biweekly one. You’re convinced you don’t want to behave that way anymore, but here you are, doing it again. Psychologist Michael Inzlicht of the University of Toronto has long been fascinated by how we keep ourselves in check — or don’t — whether you call that willpower, self-control or something else.