That was most likely seasonal affective disorder (SAD, or winter blues). I've had a bad winter once something like 20 years ago, and it was so bad that I'm stil

That was most likely seasonal affective disorder (SAD, or winter blues). I've had a bad winter once something like 20 years ago, and it was so bad that I'm still obsessed with proper indoor lighting. tl;dr of it is that you want soft, yellow light in the evenings, and full spectrum, much more powerful than you think in the rest of the day, especially mornings.