Yeah, I associate being tired with being relaxed. Being anxious sucks up a LOT of energy, so I usually end up pretty tired when I come down. So having that hit in the middle of my sleep cycle is really jarring.
The annual cycle was something that was pointed out to me by someone else and has just since turned out to be true. In my 20's, I usually found myself sad and depressed around the holiday season, but that was due to my life circumstances at the time (being lonely, feeling like I was wasting my youth, etc). I can't really say whether the two are related.
I do feel like I'm coming out of the worst of it now, thankfully. I just need to figure out at that point what to do next. I'd really like NOT to deal with this next year.