Nuvigil is used in the treatment of excessive sleepiness that is caused by apnea, narcolepsy, or work shift sleep disorder. It is an agent that promotes wakefulness. This medication is not used to cure sleeping disorder and might not be able to get rid of all your sleepiness. Nuvigil (armodafinil) is a medication that treats excessive sleepiness usually caused by narcolepsy or the shift work sleep disorder. The drug is known for how it promotes wakefulness especially in people who have working schedules that keep them from having a normal sleep routine. Nuvigil is believed to work by affecting a certain chemical in the brain that causes sleep or controls the sleep cycle. Nuvigil may is supplied in the form of a solution and thus it should be taken orally once a day. It should be taken in the morning as a single dose, and it should never be prescribed to children. The side effects might be too severe for pediatric to handle.