I'm sure I suffer from SADD; in other words, sun seems to help me immensely. The worst time of year is late October to April (I live in a northern climate, unfortunately). This problem is getting progressively worse, so I'm thinking of buying a sunlamp for the winter. Generally, I do notice that getting enough sun seems to lift my spirits, almost instantly.
I think exercise helps: at least, that's what I've read. My job happens to be physical, so I do get exercise. But I also still battle with depression off and on. The question is, would I be even more depressed if I stopped exercising?
I also had the realization, recently, that I think one reason why I drink wine regularly is to help me to keep my spirits up. This is something I just "do" (have done, for awhile) without thinking about. I'm not talking about getting drunk all the time, I just mean a glass or 2 of good quality wine, along with a nice evening meal.
Then, of course, the obvious: having an all-encompassing special interest. I think the times I've been most depressed are when I'm "between special interests", kind of searching around for the meaning of my existence.
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"death is the road to awe"