I normally have low energy due to a low number of red blood cells. But, after a 5 day bout of Covid I , too, am totally exhausted. I used to need 9 hrs. To feel my best, now it is 11. Plus I fall asleep soon after dinner while I’m reading or watching TV which I’ve never done. I don’t think I have any other post Covid symptoms, except maybe more than normal tight coughing at times. I do take a Solaray High Energy vitamin pill which seems to help but may be psychological. It didn’t dawn on me until today that this was related to Covid. I am 76 yrs. Old and figured I was really winding down quickly. Thank you so much for your comment ; I feel better just knowing that this could definitely be related to Covid. Good Luck to you.