The Symptoms and Stages of Fatal Familial Insomnia

The hallmark of fatal familial insomnia is appropriately enough. Enthomnia. Fatigue is one cognitive decline. You're going to lose some memory. But they don't all have the same symptoms. The mean age of onset is 50 years old. For the most part, it strikes you around late, late 40s, early 50s. Once it happens, you've got between one to maybe three years of basically a living hell before you die of this.