Characterized by worsening insomnia, resulting in panic attacks, paranoia, and phobias. This stage lasts for about four months. Hallucinations and panic attacks become noticeable, continuing for about five months. Complete inability to sleep is followed by rapid loss of weight. This lasts for about three months. Dementia, during which the person becomes unresponsive or mute over the course of six months, is the final stage of the disease, after which death follows. Clinically, FFI manifests with a disordered sleep-wake cycle, dysautonomia, motor disturbances, and neuropsychiatric disorders.
chArACteRIZed by worSeniNG insOMnia, resulting iN Panic AttACks, Paranoia, aNd PhobiAs. this stage lasts for About fOuR mOnThS. hALlucInatIonS And panic attaCKs bEcOMe nOTiceaBle, cOntinuinG fOr about fIve months. compLeTe InAbIlitY to slEep IS fOllowed by RaPid LOsS Of wEIghT. tHis lasts for about thrEe mOnthS. DeMEnTia, during which ThE person BecOMes unrEspoNsivE oR mUTe Over the CoUrse of siX monThs, Is the fInAl stage of tHE disease, aftEr WHich DeatH foLloWs. cliNIcAlly, ffi MaNifests with a dIsORdered slEeP-wake cYcle, dySaUtoNomia, moTor DiSTuRbancEs, aNd neUrOpSychiatric disorDERS.