Modafinil is a widely used prescription medication designed to promote wakefulness in people suffering from sleep-related disorders such as narcolepsy, shift work sleep disorder, and obstructive sleep apnea. It works by stimulating certain brain pathways responsible for alertness and focus without causing the jittery effects commonly linked to traditional stimulants. Due to its balanced mechanism of action, modafinil is often preferred for long-lasting mental clarity and improved daytime performance.