Feeling Tired ya'll?

So, as it is...I am part of las vegas mom groups, down syndrome groups, heart surgery groups, and TGA (transposition of the great arteries) group.  Well in a lot of my TGA groups, people have been saying that they are tired and it is common for a person with TGA, in their older age, to feel more tired than the average person.  (????)  uh, exactly how do they do that study?  No seriously?  I don't get it.  How would we know if we were more tired?  We only know how we feel.  We don't know any different.  We have had a heart problem since birth. 
When someone asks me if I had any trouble doing sports or activities in high school.  I could think of days that I was tired or felt off; but doesn't everyone have a day like that.  I mean, how exactly does this study occur.  LOL.  This is pretty much a big joke to me.  I feel tired all the time...but I believe that is becuz I am a mom and when you are a mom, you don't get sleep, so therefore you are tired.  So yes I am tired, but I don't think it is becuz of my heart.