Before revision: The MSLT is used extensively to test for disorders of excessive somnolence such as narcolepsy or idiopathic hypersomnolence, to distinguish between physical tiredness and true excessive daytime sleepiness , or to assess whether treatments for breathing disorders are working .
After revision: The MSLT is used extensively to test for central disorders of hypersomnolence such as narcolepsy or idiopathic hypersomnia, or to distinguish between physical tiredness and true excessive daytime sleepiness .