Provigil (modafinil) is a well-known prescription medication used to treat excessive daytime sleepiness associated with conditions such as narcolepsy, obstructive sleep apnea, and shift work sleep disorder. It helps improve alertness and wakefulness by affecting certain chemicals in the brain that regulate the sleep–wake cycle. Because of its reliable effectiveness and lower risk of dependency compared to traditional stimulants, Provigil has become a preferred option for patients who need sustained mental focus and energy throughout the day.