Hypersomnia

Hypersomnia is a disorder characterized by excessive sleepiness, extended sleep time in a 24-hour cycle, and the inability to achieve the feeling of refreshment that usually comes from sleep. There are two main categories of hypersomnia: primary hypersomnia (also called idiopathic hypersomnia) and recurrent hypersomnia (also called primary recurrent hypersomnia). Both have the same symptoms, but differ in frequency of occurrence.