The law of inertia tells us a body in motion stays in motion. And the same goes for projects, creative ideas, daily tasks, half-written emails, and that thing you stopped working on to read this article. When you interrupt a task, it can be difficult to pick it up again.
And we are interrupted nearly every three minutes, according to Gloria Mark, professor of informatics at University of California, Irvine. What's telling is that roughly half those interruptions are self-imposed.
The result: When you're working on something without a clear deadline, seeing it through to its end can be a huge challenge.