SloppyMeathole

I see what you're saying. Insomnia is a result of the underlying disease, rather than the thing that actually kills you, which is the prion disorder. Thanks for the clarification.

What about Fatal familial insomnia?

According to Wikipedia, "(FFI) is an extremely rare autosomal dominant inherited prion disease of the brain. It is almost always caused by a mutation to the protein PrPC, but can also develop spontaneously in patients with a non-inherited mutation variant called sporadic fatal insomnia (sFI). FFI has no known cure and involves progressively worsening insomnia, which leads to hallucinations, delirium, confusional states like that of dementia, and eventually, death. The average survival time for patients diagnosed with FFI after the onset of symptoms is 18 months."

Am I missing something? This disease appears to cause death due to insomnia.