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In 2026, Provigil (modafinil) continues to be a cornerstone treatment for managing conditions that cause extreme daytime drowsiness, specifically narcolepsy, obstructive sleep apnea, and shift work disorder. Classified as a eugeroic, or wakefulness-promoting agent, it functions by subtly altering neurotransmitters in the brain's sleep-regulation centers—such as dopamine, orexin, and histamine—to keep the mind alert without the intense physical "jitters" common with traditional stimulants. While it is highly effective at reducing "brain fog" and improving executive function during waking hours, it is a Schedule IV controlled substance and should only be used under medical supervision. Users should be aware of potential side effects like headaches or nausea, and importantly, that Provigil can reduce the effectiveness of hormonal birth control for up to a month after the last dose.