Sufferers of IH share common symptoms like excessive daytime sleepiness, sleep inertia, brain fog, long sleep periods, and others. * Excessive daytime sleepiness, characterized by persistent sleepiness throughout the day and often a general lack of energy—even during the day after apparently adequate or even prolonged nighttime sleep. People with EDS nap repeatedly throughout the day and have strong urges to sleep while driving, working, eating, or conversing with others. * Sleep inertia (also known as sleep drunkenness), characterized by having extreme difficulty waking up and feeling an uncontrollable desire to go back to sleep. * Clouding of consciousness characterized by inattention, thought process abnormalities, comprehension abnormalities, and language abnormalities. These symptoms may affect performance on perception, memory, learning, executive functions, language, constructive abilities, voluntary motor control, attention, and mental speed. Sufferers can complain of forgetfulness, confusion, or inability to think clearly. * Excessive sleep (9 hours or more over a full 24-hour period), without feeling refreshed after waking. Daytime naps can be up to several hours and are also unrefreshing. Some studies have shown increased frequencies of palpitations, digestive problems, difficulty with body temperature regulation, and other symptoms in patients with IH. Anxiety and depression are frequent, likely as a response to chronic illness. A case series in 2010 found that peripheral vascular symptoms, such as cold hands and feet (e.g., Raynaud Syndrome), were more common in people with IH than in controls. Other autonomic dysfunctional symptoms, such as fainting episodes, dizziness upon arising, headaches (possibly migrainous in quality), food cravings, and impotence may also be correlated with IH. Researchers have found that people reporting IH symptoms report high levels of autonomic dysfunction on par with other conditions of autonomic failure (i.e., MSA and diabetes). , there is no evidence to suggest such symptoms are related to IH in any way.
Idiopathic hypersomnia
Strephosymbolia
Psychoorganic syndrome
Nightmare disorder
Erotolepsy
Interictal dysphoric disorder
Narcolepsy
Klazomania