Modafinil reduces extreme sleepiness thanks to narcolepsy and other sleep disorders, like periods of stopped breathing during sleep (obstructive sleep apnea). it's also wont to assist you to stay up during work hours if you've got a piece schedule that keeps you from having a traditional sleep routine (shift work sleep disorder). This medication doesn't cure these sleep disorders and should not get obviate all of your sleepiness. Modafinil doesn't take the place of getting enough sleep. It shouldn't be wont to treat tiredness or hold off sleep in people that don't have a disorder. It is not known how modafinil works to stay you awake. it's thought to figure by affecting certain substances within the brain that control the sleep/wake cycle.