Narcolepsy is a brain disorder that causes people to have excessive daytime sleepiness, wake up suddenly at inappropriate times, and have trouble staying awake. It can be difficult to treat, but a medication called buy modafinil online can help with these problems. It works by stimulating the central nervous system, keeping you awake and alert. It is usually taken as a tablet in the morning. Several medicines are available for treating narcolepsy. These include a type of drug called a stimulant, such as modafinil, armodafinil, pitolisant, solriamfetol, and sodium oxalate.