Working too hard?

It's a constant tug-of-war with me. I wonder if I'm working too much or not enough.

Not enough -- I feel as if I'm not living up to whatever potential I have. I always feel behind at work, no matter what I do. I feel like I could be doing so much more. I've been working on a research project outside of work, and it feels really good. Like my brain is in gear. What other outside work projects could I realize if I made them a priority? But how many hours are there in a day?

Too much -- I'm constantly tired, I feel like I never have time to try something new. I've put my "creative life" on hold, as in the me who used to care about blogging and personal writing in general. The me who used to watch weird foreign films and seek out interesting experiences. I thought about taking a class, just to learn something I don't know about. Who has time for that, though?