I absolutely can relate. I'm a journalist which means my hours are irregular and I often work late, and while I love my job it is also frequently stressful. You've already identified this but one thing that's crucial for me is getting enough sleep. If I don't get enough sleep for extended periods of time my mood seriously declines and sometimes gets dangerous. I also have to work really hard to make sure I'm eating enough and regularly. Basically, I try to keep a schedule that's not necessarily doing everything at the same time every day -- that's damn near impossible -- but a schedule where I am doing important things (eat, sleep, go to therapy, etc) regularly and then everything else (usually) falls into place.