" These sites are especially harmful after the workday is over, where the freedom in your schedule enables them to become central to your leisure time. If you’re waiting in line, or waiting for the plot to pick up in a TV show, or waiting to finish eating a meal, they provide a cognitive crutch to ensure you eliminate any chance of boredom. As I argued in Rule #2, however, such behavior is dangerous, as it weakens your mind’s general ability to resist distraction, making deep work difficult later when you really want to concentrate. "

― Cal Newport , Deep Work: Rules for Focused Success in a Distracted World