Thanks for reposting this. I have been living with the "gray beast" on and off for more than a decade. First signs go back to early teens and it's getting more intense and persistent over the years. Or maybe it has always been the same but I've been slowly shifting away from the denial and bargaining stage and closer to acceptance.

Although depression has been one of the several hypotheses I've come across, the popular image of it typically focuses on the "black beast", which hasn't really been a problem for me, not more than a random "normal" person at any rate. That's why I haven't sought professional help so far. Perhaps this article will be the proverbial kick in the butt to do so.