I think about Tim Urban’s Instant Gratification Monkey pretty regularly.
If you’ve never read “Why Procrastinators Procrastinate,” you should. At the end, there’s a Part Two, but I’m not going to link to it here because you need to read Part One first.
Tim also has a TED talk, but if you’ve got 15 minutes, I recommend reading his two posts instead—they go into it a little deeper, in my opinion.
But if you can only listen and not read, here it is: