Everyone knows that if you hit the weights, you need to sleep well. It also turns out that if you don’t sleep well, you should hit the weights. Sports scientists at Appalachian State University in North Carolina found some interesting correlations between hitting the sack and hitting the iron. For one, all subjects in their experiment slept better on days they trained in the weight room. Specifically, when subjects lifted weights early in the morning they were able to fall asleep earlier at night. Strength training later in the day reduced the number of times they woke during the night. Adequate sleep is not only one of the most important factors for recovery, but also a long-term predictor of good health, mental well-being, and longevity. Working to improve sleep habits should be a priority for everyone.