Wouldn't it be convenient if we had a warning sign when our personal battery level was getting low? It would be a clear signal that it was time to stop and recharge before our minds and/or bodies quit. In retrospect, we do have those warnings if we learn to pay attention to them. Decreased personal battery levels show themselves in our irritability, difficulty sleeping, lack of concentration, diminished creativity, lack of patience, overlooking of details, and even personal relationship upheaval. These all point to low energy reserves and predict a crash on the horizon if we don't do something to restore our levels.