My personal experience is not dissimilar to that of being, "kind of pregnant." You Are or you are Not. You have either had cancer or you have not. If you have had cancer then and only then do you understand the treatment-related side effects of fatigue. It is a fatigue that is chronic, a feeling of being, "worn out" each and every day. I have gotten used to yawning all day, every day, and am at peace knowing that a nap is not and will never be a "cure".