I know nothing. I haven't figured it out at all. You'd think that after 4+ years I should have discovered at least one measly little way to "listen to my body" (now there is an utterly rubbishy phrase).
But no. Whatever it is, it floors me out of the blue. As in totally. Which is the only regularity I can see. That and that I haven't the faintest idea why for several days in a row (!) I can be - yippee - so well and then - whoom - the shit hits the fan, just like that.
I mean, honestly, I have not attempted the impossible, run a marathon or missed out on rest and sleep or whatever.
So, in other words, there is no telling where this is going. Obviously, there never has been but you get sort of cheated for a while. That and spring.
But what else is new. I have never been good at letting stuff happen, let's face it. Don't get ill if you can help it. I mean it.