Fatal familial insomnia, a rare genetic disease that causes sleeping difficulties, dementia, and involuntary muscle twitching, has no cure and gets worse over time. The symptoms, however, can be slowed through treatment but it is temporary, according to Cleveland Clinic.
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According to data provided by the National Organisation of Rare Disorders, FFI affects an estimated 1 to 2 people per million every year. FFI passes from parent to child and between 50 and 70 families around the world are suspected to carry the genetic mutation that causes the condition.
