<qa>  What is the benefit of Modafinil?Modafinil has broad efficacy in health and illness. It enhances cognitive function in normal young adult males, as tested by digit span, visual pattern recognition memory, spatial planning and stop-signal reaction time. While the majority of patients prescribed modafinil received the drug for non-cognitive indications e.g., fatigue, sleepiness, several have reported improved cognitive function, especially with respect to tasks that require attention and concentration. 