We're heading into the time of year that I've always struggled the most with my chronic depression. I really have to force myself to get outside and get sunlight, exercise, and eat better than usual. Those three things go a long way. The short days and cold weather really make it hard.
Do you have a light box? Seasonal Affective Disorder has high co-morbidity with depression and getting the right amount of the right wavelengths of light at the right time has a surprisingly helpful effect. If you're into hacking in physical space (aka making stuff) set up your bedroom so that you get very bright light in the morning at a set time. Sunrise alarm clocks are crap so ignore them and build the system yourself.
force yourself into a routine, and it'll make it a whole lot easier. i also believe proper sleep cycles are especially important for those who are/have battled depression.
