Ryn Daniels has written an excellent piece about time management and productivity when you are burned out. The advice is spot on. I also do these things when I'm not feeling my best too.
"It's one thing to talk about productivity when you're already feeling motivated and productive, but how do you get things done when it's hard to even make it through the day?"
https://superyesmore.com/productivity-when-you-just-cant-even-0c73d6a1f086209af420c2ced442a2e8