Maybe you'll do some more editing on that novel tomorrow.
Maybe you'll tackle e-reader formatting after a long weekend.
Maybe you'll sit down and finish your book outline after the Bond movie marathon.
Maybe you're just procrastinating.
There's a maxim out there that goes, "if you do what you've always done, you'll always get what you've always gotten." While it obviously applies to writing, this also applies to life. If you want to lose weight and/or get in better shape, for example, eat better and work out. Thinking and hoping don't get you anywhere. If you want to develop better social skills, go out and talk to people.
And if you want to be a writer, you have to write.
I'm not trying to pull off a Knute Rockne speech here. You don't need to win one for the Gipper; you just need to win one for yourself. In this age of global connectivity, instant gratification, and a zillion entertainment options, it's easy to get sidetracked and distracted. Carve out some time for writing, editing, plotting, or whatever it is you need to do. Use a calendar (or a day planner, if you're still living in the Jurassic Era) to mark it down and remind you. Your characters and your readers (current or future) will thank you for it.
Years ago, I came across another maxim: "Writers write. Everyone else just talks about it."
Let's not just talk about it.