Chronic fatigue syndrome refers to severe, continued tiredness that is not relieved by rest and is not directly caused by other medical conditions.
Did you have many congregation members, particularly pioneers, that said they had " Chronic fatigue syndrome" ?
That's their "get-out-of-jail-free card." They were free to cancel anything at anytime and it was their legitimate reason for not doing anything that didn't involve field recruiting. And if they didn't make their time, it was due to chronic fatigue syndrome.
"Help clean the hall? I have this chronic fatigue." "Work with the C.O.'s wife on Thursday. Sorry, my chronic fatigue is getting to me."
It seemed to make the person feel that they were special- See "Munchausen Syndrome" at [ http://en.wikipedia.org/wiki/M%C3%BCnchausen_syndrome ]
I am not saying that the actual CFS is not real. But it seems that it was popular with JW's that did not understand that their cognitive dissonance and depression over being a Witness could cause depression and lack of energy.