Crash, Bang, Boom!

I guess I should have seen this coming. My past experiences have proven that when I am practicing just for the sake of fundamental development, I lose focus on why I am playing in the first place. It is easy enough to understand; when I have a performance coming up, I practice more often and more attentively. When I do not have anything scheduled, I have trouble staying motivated after a while. Right now I am caught in a cycle of "play this" and I do and then... what? I find myself not really motivated to practice pieces out of a book without an opportunity to perform. It is taking a greater effort to put in the practice time behind closed doors and on pieces that will make me better but without immediate reward. That's tough for me right now. Anyone have words of wisdom to share?