There can come a time when our brains, our souls, just have to shut down in a sort of self protective/need of rest phase. It all just gets too much, even depression is too much and we need nothingness, decompression, levelness with no up, no down, just being.
It sucks, but then again, it's kinda meh, so it doesn't even suck.. it just *is*.
Don't get stuck there though. The emotions are there, and will need to be addressed at some time when you're mentally able. If you find you're getting stuck there, then you might want to seek some kind of help to get out of it.