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Sleep movement disorders, such as restless legs syndrome (RLS) and periodic limb movement disorder (PLMD or PLMS) can also cause secondary hypersomnia. Although RLS does commonly cause EDS, PLMS does not. There is no evidence that PLMS plays âa role in the etiology of daytime sleepiness.
Symptoms of hypersomnolence disorder include: 1  Excessive sleepiness, despite getting at least seven hours of sleep per night. 2  Recurrent daytime naps or lapses into sleep during the same day. 3  Non-restorative nighttime sleep that lasts for more than nine hours.