by Wesley G. Vaughn If someone tells you, "It's not how long you sleep, but how well you sleep," they're half right. It's both. Research studies show us that quantity and quality of sleep are correlated and work together. We cannot have quality sleep unless we have enough sleep. On the other hand, staying in bed for a certain amount of time does not automatically provide us with much needed rest, relaxation and restoration. Sleeping long but not sleeping well may be called "Empty Sleep...