I don't know why. It always starts slowly at first, but it is so persistent and powerful and creeping and insidious that it actually begins to manifest through my very perception of reality. It feels like the darkness is encroaching. Like the days aren't as long as they used to be. Like life isn't as warm as it used to be. Sometimes the feeling is so powerful and feels so physical that I actually start to shiver out of depression and the only thing that can make me feel better is getting under a blanket and turning on the heater. I know it's all in my head, but it feels real. Maybe I'm just going mad. Anyone else ever feel this way?