Two tests that are considered essential in confirming a diagnosis of narcolepsy are the polysomnogram (PSG) and the multiple sleep latency test (MSLT). Doctors often try modafinil (Provigil) or armodafinil (Nuvigil) first for narcolepsy. Operating a vehicle with untreated narcolepsy can be very dangerous and some states even have laws against it. Modafinil and armodafinil aren't as addictive as older stimulants and don't produce the highs and lows often associated with older stimulants. Narcolepsy causes significant daytime drowsiness and sleep attacks. In a majority of cases, it also causes unexpected and temporary loss of muscle control, known as cataplexy. It is dangerous because you can have excessive sleepiness or a sleep attack at any time of the day, in the middle of any activity including eating, walking or driving. The Social Security Administration (SSA) does not recognize narcolepsy as a medical condition that automatically qualifies you for disability benefits.