How often has this happened to you? You sit down to work on a piece of writing for which the deadline is fast approaching. You feel energized and optimistic. Shortly after you begin, the notification alert on your smart phone goes off. Or, a colleague pokes her head in your open door and asks if you have a moment. Or, you look back at the previous sentence you’ve written and decide that it could be worded better. And so on. Taken in isolation, such small interruptions seem harmless. However,