Burning Out?

It’s the end of the week and I feel so drained and exhausted. It’s a long tiring week and it is showing. I’m being cranky and irritable. Is this a sign of being burned out? I’ve been working with the company for most three years. Long by my standards. Also, it’s been a hectic year in terms of objectives: MBA, ISO 9001, etc. They left me exhausted, but they were what drove me on. But right now the only thing motivating me is mentoring my unwitting protege. It’s quite ironic since just this morning I asked her if she is having fun. She said she is. And I told her that it’s good since work should be fun. But I’m afraid to ask myself the same question. Maybe a short vacation will fix me.