This has been the first year I've actually consciously noticed the seasons changing. I attribute this in large part to my lack of indoor lighting. I can't stay up as late as I used to, because the constant darkness makes me sleepy, even in the light of my monitor. I have a giant window on my wall, which makes it impossible to ignore the sun's chipper rays in the morning, even though the window is on the west side of the building. The effect is even stronger in the Brohaus, where I have an eastern window. I am no longer able to sleep in late unless I am overwhelmingly tired.
Perhaps another part of it has been the heater varying between functional and off, over the course of the winter. You notice the cold more when you have no choice but to face it. I wonder what else I'll notice in this manner.