Just because you can't see the wind doesn't mean you doubt it exists. Because you can both see and feel the effects of the wind, you know wind is a reality. The fatigue often associated with scleroderma and lupus can easily be compared with the properties of the wind. Although fatigue itself is invisible, it exists, and its effects are a reality.
More energy is needed to move such affected joints.
Joints and muscles weakened by scleroderma and lupus symptoms, or used less due to pain, swelling or stiffness, cause extra work for your other normal joints and muscles. Try alternating tasks with rest periods, or break one job into smaller jobs. Be attentive to your body's signals, rather than ignoring those helpful hints. Learn to recognize your body's daily cycle and plan around the times you ususally feel tired. Take advantage of good days, but don't overdo.