This is the darkest time of the year, when the days are at their shortest. For example today the sunrise was at 9:44am and sunset at 3:04pm. In the last few weeks the weather was also very cloudy and foggy, and there was no snow, which made days even darker. The local newspaper reported one day that at noon there was something like 350 lux of light, while in the typical sunny autumn day there could be 50 000 lux.
Many people suffer from depression because of the lack of the daylight. I don't know I if suffer from that, but I have noticed that I tend to eat and sleep more. I crave for chocolate and anything with tons of calories.
This week there was a couple of sunny days, and some snowfall, so now it is much better. And in a couple of weeks the worst will be over and the days will start to get longer again.