Modafinil, which is marketed under the name Modvigil 200, is frequently referred to as a "miracle drug." It helps people stay awake and focused by treating narcolepsy, sleep apnea, and shift work sleep disorder. Without the jittery side effects of conventional stimulants, Modvigil 200 improves attention, cognitive function, and alertness. Many users say it has changed their lives, particularly for people with rigorous job schedules or crippling daytime drowsiness.