<unk>  <unk>  is characterized by persistent<unk>  and often a general lack of energy, even during the day after apparently adequate or even prolonged nighttime sleep.<unk>  can be considered as a broad condition encompassing several sleep disorders where increased sleep is a symptom, or as a symptom of another underlying disorder like narcolepsy, circadian rhythm sleep disorder, sleep apnea or idiopathic hypersomnia. Some persons with<unk> , including those with hypersomnias like narcolepsy and idiopathic hypersomnia, are compelled to nap repeatedly during the day; fighting off increasingly strong urges to sleep during inappropriate times such as while driving, while at work, during a meal, or in conversations. As the compulsion to sleep intensifies, the ability to complete tasks sharply diminishes, often mimicking the appearance of intoxication. During occasional unique and/or stimulating circumstances, a person with<unk>  can sometimes remain animated, awake and alert, for brief or extended periods of time.<unk>  can affect the ability to function in family, social, occupational, or other settings. A proper diagnosis of the underlying cause and ultimately treatment of symptoms and/or the underlying cause can help mitigate such complications. According to the National Sleep Foundation, around 20 percent of people experience<unk> .
Excessive daytime sleepiness
Hypersomnia
Irregular sleep–wake rhythm
Dyssomnia
Orthosomnia
Sleepwalking
Fidgeting
Parasomnia