The first winter that I've ever experienced SAD.
I was getting more and more down due to the lack of sun, even doing the job i love, horticulture (I'm a nursery man).
So as well, for the first time this year, I've started to take vitamin D , and it's really helped a lot, and got my out of this god awful melancholy.
The irony is that the doctor a few years ago, said that I probably produce to much vitamin D , as exposure to bright sunshine would make me dizzy, nauseous and unable to get energy , so you can tell how bad this winter has been for lack of sunshine!!