Sometimes we get tired of what we're doing. I play guitar and compose music, which is pretty much the greatest thing in the world, and sometimes I don't want to do it any more.
So what do we do when we feel like this?
My friend Melissa Danielson, a therapist, has written a book that I've found really helpful. The Other Side of the Couch is aimed primarily at mental health care professionals, but it applies to any career or pursuit. Causes of burnout, and most importantly, strategies for overcoming it, are discussed within. Give it a look and I think you'll find some useful tools.