"It might also have something to do with a sense of productivity feeding back into the depression but that's a different story."
I don't suffer from depression but FWIW I have noticed lack of productivity leading to a down mood in the same way simply accomplishing something (even getting the room cleaned up) can lead to an up mood.
I don't suffer from depression but FWIW I have noticed lack of productivity leading to a down mood in the same way simply accomplishing something (even getting the room cleaned up) can lead to an up mood.