Modafinil is a prescription medication used to treat excessive sleepiness caused by narcolepsy, obstructive sleep apnea, and shift-work sleep disorder. It works by alerting the levels of certain chemicals in the brain that control wakefulness and sleep. It is available under various brand names, such as Modalert, Modvigil and Provigil. Medical use of Modafinil was approved by the FDA. Modafinil is classified as a wakefulness-promoting agent and is thought to work by stimulating the release of certain chemicals in the brain, such as Dopamine and Norepinephrine, that promote wakefulness and alertness. For more information on Modafinil, visit the website Health Matter.