t takes strong willpower to say no to ten more minutes of texting friends or playing instead of going to bed. It also takes willpower to say no to ten more minutes of sleep when you are still tired and don’t want to get up for school (or work). This is because immediate gratification has a serious edge over some possible vague reward that may, or may not, show up in the future, and only if you work for it. In other words, when working from our evolutionary default setting, now will beat later every time!