Nootropics are substances that enhance cognitive functions like focus, memory, productivity, and alertness. Modafinil and its brand variant Modalert are popular nootropics used to promote wakefulness and mental clarity, especially in sleep-related disorders like narcolepsy, sleep apnea, and shift work sleep disorder. These are also termed smart drugs. They are often used off-label to reduce fatigue. While generally well-tolerated, they should be used responsibly and under medical supervision due to potential side effects and dependence risks.