A MSLT is a diagnostic test used to determine sleep disorders in which excessive daytime sleepiness is the primary complaint.The most common sleep disorders that MSLTs diagnose are narcolepsy and idiopathic hypersomnia.
A MSLT is also useful in differentiating between the two sleep disorders as their symptoms are very similar in nature. If you are suffering from excessive daytime sleepiness and believe that you may have narcolepsy, idiopathic hypersomnia, or any other sleep disorder, discuss your symptoms with your primary care physician.