So, a question: when you're feeling down or depressed or in a bad mood, what do you do to cheer yourself up?

The reason I ask is because this job I have has been draining me both physically and emotionally. I sometimes find myself coming home and feeling like my life has reached its nadir and that the things that would cheer me up in the past aren't quite working anymore. Thus, I ask all of you out there in internet land for ideas.