At this point in the semester (or quarter) it is useful to think about what sorts of things one can do that will help one remain engaged and enthused in the classroom. Just when our energy is running low, so is our student's. Here is something I do to revitalize.
I pick some philosophy to read - just for myself - that has nothing whatsoever to do with my own research or with what I'm currently doing in the classroom. It feels like a guilty pleasure. But it really helps me in the classroom. It reminds me of what I love about philosophy and teaching philosophy. Recently I've been reading up on the Absurd, and I also purchased a book on Epictetus by Long. Neither of these topics has anything to do with 18th century philosophy of mind, or with the courses I'm teaching. But being as worn out as one gets at this point in the year, I don't expect I can do much research now anyway. Might as well indulge my philosophical curiosity.