1.) I knew that I was heading toward the end of my tenancy at the Company of Yellow and Green
2.) I was getting regular intense exercise.
Number two is probably the biggest contributor.
There's some other stuff: I was in my own apartment space that was actually pretty decent, which is such a major change from the Big Broken Box™ that it's night-and-day, and it has to be contributory. But I'm still laying odds that the regular intense exercise was the single biggest contributor.
And no my little fluffqueen, that is no brilliant revelation. It is merely for me to add more fuel to the motivation fire.