Which term refers to the very rare degenerative brain disorder that causes a total lack of sleep, eventually leading to death?

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Fatal familial insomnia is a very rare degenerative brain disorder that causes a total lack of sleep, eventually leading to death. Primary insomnia refers to regular difficulty falling asleep or staying asleep that is not related to another medical condition. Atypical insomnia and medical insomnia are not recognized terms for specific sleep disorders.

Which Term Refers to the Very Rare Degenerative Brain Disorder