About 20% of adults experience excessive fatigue that impairs their ability to function well at work and at home. Some are able to bounce back after taking a short respite from work or by taking medication. But there is a significant number of people whose stressful experiences last longer that usual. Chronic fatigue syndrome (CFS) affects at least 800,000 people in the United States. This disabling fatigue usually persists for as long as six months or even longer. The eight common CFS symptoms include muscle pain, joint pain, memory gaps …