" Once I got over feeling sick in the morning, I’ve been feeling good,” Levela said. “Vigorous and strong. Although, lately, I get tired easily. I want to sleep late and take naps in the day, and sometimes if I stand for a long time, my back hurts.” “Sounds about right, wouldn’t you say,” Velima said, smiling at her daughter. “Just the way you are supposed to feel. "

― Jean M. Auel , The Land of Painted Caves (Earth's Children #6)