I have no idea whether mine is virus-related or not, but I am randomly crushed by terrible fatigue (the 'curl up on the window seat and wake up 3 hours later' or 'if I sit upright I'm going to pass out' variety): plus broken sleep cycle, in which I wake every morning between 4:30 and 4:45, and it takes a while to get back to sleep which is not good with a theoretical 8am WFH start.
Have promised myself today that I will not fall asleep on the sofa after lunch.
Have also promised myself I will go out amongst the plague vectors, for I have run out of cheese.

Best wishes, and I hope your employers are being sensible and sympathetic!