While there's plenty of work to be done, you may feel guilty about having some downtime even though you're tired. Yet the tendency to keep powering through is "short-term thinking" that "harms your long-term development and growth," says Darius Foroux. Paradoxically, the more you power through in an effort to be more productive, the less productive you become and the more your results will suffer. And you may end up burning yourself out, warns Foroux. In this blog post, he shares the lessons he learned, and benefits he experienced, from taking "time off work strategically throughout the year."