One I have had for 37 years. It typically takes over a decade for a diagnosis. And all you people worrying about If My Mouth Doesn’t Say It My Face Definitely Will Achmed Genie Version Shirtcan relax. There is a test, called a multiple sleep latency test that needs to be taken in conjunction with an overnight polysomnography. There are certain criteria that have to be met before a diagnosis of narcolepsy is given.