Primary hypersomnia, also known as idiopathic hypersomnia, is a sleep disorder characterized by excessive daytime sleepiness, difficulty waking up, and long periods of unrefreshing sleep. There are several synonyms for primary hypersomnia that are often used interchangeably, including idiopathic hypersomnia, essential hypersomnia, and non-apnea hypersomnia. Additional synonyms for this disorder include hypersomnolence, hypersomnia syndrome, and daytime sleep disorder. While there are different names for primary hypersomnia, they all refer to the same condition, which is a chronic and debilitating sleep disorder that can significantly impact an individual's quality of life. Treatment for primary hypersomnia typically involves medications and lifestyle changes to improve sleep quality and reduce daytime sleepiness.