10 Causes of Hypersomnia
Cause #5: Norrie Disease
Norrie disease is a genetic disorder where it mostly affects the eye and almost always causes blindness. Some also suffer from progressive hearing loss and learning difficulties. Patients with Norrie disease may also develop cataracts, psychotic-like features, incoordination of movements, behavioral abnormalities, and more.
There can be behavioral and cognitive symptoms, learning difficulties, and developmental delay in 30 to 50 percent of males with Norrie disease. It is caused by an X-linked recessive inherited gene. Norrie disease can be associated with central or primary hypersomnia.
Advertisement
