If you wake up refreshed but later need a nap, that's not anemia, either. Anemia causes fatigue only when you exert yourself. And the milder the anemia, the more exertion it takes. It limits only strenuous exercise. The true percentage is much higher.
Surveys use a cutoff to define anemia.
The cutoff misses mild anemia. We screen female athletes at the University of Oklahoma. So mild anemia is common. It saps stamina and causes undue breathlessness and fatigue when working out. Iron in meat is the easiest to absorb.