 Fatigue is a common problem for many people with HIVAIDS, interfering with daily activities and serving as a significant barrier to working among those whose health is otherwise stable or restored by antiretroviral ARV medication. Fatigue in HIV is associated with disability and diminished quality of life. It may be caused by ARVs or by the virus itself. This study will determine if modafinil can reduce fatigue in HIVAIDS patients. 