My wife went through this for about a year (pre covid). She went from being extremely active to sleeping for 16 hours a day and still being exhausted. She got t

My wife went through this for about a year (pre covid). She went from being extremely active to sleeping for 16 hours a day and still being exhausted. She got tested for just about everything, and all they could find were signs that her body had fought off a viral infection very recently. Eventually she recovered on her own. I'll be honest, it was really scary. At various points they were checking for all sorts of cancers, even going so far as to do a bone marrow biopsy. Every time something was ruled out the specialist we were sent to would give up and send us to another specialist. We never got a real answer, other than the viral thing, and she eventually recovered on her own.