Should I sleep whenever I feel tired?

Fatigue can range from just feeling abnormally tired to feeling so exhausted that it's hard to move. Not only is the body tired, but the brain is fatigued as well, so that concentration is difficult and your short-term memory often fails you. Some doctors believe that Chronic Fatigue Syndrome is closely tied to fibro; many people suffer from both. Despite naps and hours of sleep, the body never really gets to the restorative sleep stage and so feels unrested.