An excellent read on Reason.com: Triumph of the Willpower
A couple excerpts:
reason: You write about decision fatigue. I think we’ve probably all felt that. But can you describe what it is and how it works from a scientific perspective?
Tierney: Willpower—the popular idea is that it’s something that you use to resist temptation and to make yourself work. But they’ve also found that this same energy is used in making decisions, simply deciding what to have for lunch, what to do at a meeting; all these things deplete the same resource. After a while, when you’ve depleted this resource, it’s a state called ego depletion. You’ve got less self-control, you’re more prone to give in to temptation, it’s harder for you to work, and you tend to make worse decisions.
What they’re talking about is a term called “ego-depletion” which was coined by Dr. Roy Bauemeister and Dr. Mark Muraven during their research on self-control. One of the things I’ve been most interested in over the last couple of years is how to beat those lapses in self-control, how to keep doing the things I know need to be done even when I don’t have the willpower to do them. The book I wrote on this very subject: The Two-Minute Challenge - by Charles Abbott dived into the results of over 50 studies on self-control, motivation, and positive psychology and how the findings can be easily applied to real life.
One piece of advice which Reason.com’s interview also mentions is here in this tidbit:
reason: You have a great line where you say that the people with the best self-control are the people who take themselves out of situations of temptation. You say of Ulysses lashing himself to the mast, that someone with real self-control would have just taken a different route home, which I really liked. Can you talk about how that works? And how we can sort out cause and effect? If you don’t set yourself up for temptation, you’re awfully good at resisting it.
Tierney: There are a couple of strategies. The Ulysses story is a good one because that’s a classic example of what’s called precommitment. He ties himself to the mast, the sailors have plugged their ears so they can’t hear the Sirens [and be tempted to jump into the sea to their deaths]. Now that’s one form of precommitment. But an even more extreme form of precommitment, and an easier one, would be just don’t even sail by the Sirens in the first place.
That’s what they found in deeper studies recently when they ask people how they’re exercising self-control and when they follow people, the people who have the best self-control use it least because they set up habits. So instead of waking up every day and thinking, “Am I going to jog this morning or not,” they just set up appointments with friends, so they don’t have to make a decision to do it. There’s no energy, and your friend is helping to enforce [your goal]; you’re outsourcing the self-control. So they’re conserving self-control that way.
Using self-control as little as possible is the best way to exhibit self-control. Sounds funny right, but that’s exactly the same conclusion I came to in my own research. Creating habits is the key to reaching goals, and you do that by following a few basic rules which I try to explain in full in my book (another shameless plug):

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I highly recommend reading that Reason.com article, there are a few more interesting points in there worth checking out. I'm certain that I'll pick up the new book that Tierney and Baumeister wrote as well -- I'm curious to see how they presented the argument for habits, self-control, and the drive toward self-actualization.