This is the sign that I'm in a bit of a depression, although whether biological or situational I don't know.
I'm convinced that I get into this state every end-of-semester, and that I can hold it off until then. My end of semester wasn't until now because I had an intense summer class I just got over with.
So what does depression look like? At this stage, it feels like sleeping all the time and wanting to sleep more, and avoiding email. Feeling a bit down about things and not wanting to engage. Taking things a bit harder than I normally do.
The trick here is to not go in further. Get the things done I need to get done. Not take 2-hour afternoon naps (although that's hard). Try not to think too negatively. Do cognitive exercises if I need to. Push myself to write.
If I don't get this knocked down in a couple weeks, it's time for me to see my psychiatrist for a medication adjustment. I hope it doesn't come to that.