It never fails — you go to bed to get some much-desired rest, wake up thinking you got plenty, and then suddenly you're tired again. Or maybe you just feel tired all the time, and for seemingly no reason — and sometimes that sleepiness comes with a lack of energy or brain fog. Sleep is important. And fatigue definitely affects many people, but it's not the same for each person. Some are tired only for a brief amount of time — mid-afternoon lag, anyone? Others feel a constant energy lag. […]