Modafinil is used to reduce extreme sleepiness and promote alertness. It is most commonly used by patients suffering from sleep disorders such as narcolepsy, obstructive sleep apnea, and shift work sleep disorder.
Narcolepsy is a chronic sleep disorder in which people experience overwhelming drowsiness and sudden sleepiness attacks. Obstructive sleep apnea is a sleep disorder which causes people to temporarily stop breathing for brief periods of time whilst they are asleep. Daytime sleepiness is a common symptom.
Shift work sleep disorder affects people who work non-traditional hours, and causes them to experience insomnia and excessive sleepiness.
It is important to note that Modafinil does not cure these disorders and it may not completely eradicate sleepiness, however it does help you to stay awake. Please also be aware that Modafinil should not be used as an alternative to getting enough sleep or to hold off sleep or treat tiredness in people who do not suffer from a sleep disorder.