I’m a writer who has constantly struggled with procrastination and distraction. I tend to go off on tangents, and lose many hours on those journeys. My routine is to keep a hand-written “Tangents Log.” Whenever I feel the urge to diverge from my current work, I write the tangent down instead of following it immediately. At the end of the day, or the week, I review the list. Some of the items are really silly, and I’m glad I never spent the time. But the big bonus is that a lot of those tangents turn out to be very useful—they’re ideas I can work into my current project, or even better, future ideas that I can use (and sell!) later.