Commonly, January blues is both 1. The fact that the holiday season (ie Xmas) is ending, and 2. SAD = Seasonal affective disorder. This is when the cold weather and shorter days get to your mood either consciously or subconsciously.
My theory is the state of existential anxiety. In short; there’s nothing to do. No reason to be. This can be awful. And after having my TBI, I was in continual existential anxiety. No reason to exist.
But that time was “all hands on deck” with recover; where in this case EVERYTHING had to be rebuilt.
So after working, working, working, working on recovering, it’s just adapted. You may like pimple, I prefer squares. Kinda different, like that.
So now finalising my MSc keeps me busy.