has material basis in germline mutation in PRNP prion disease fatal familial insomnia https://github.com/monarch-initiative/mondo/issues/6877 https://rarediseases.info.nih.gov/diseases/6429/fatal-familial-insomnia https://www.malacards.org/card/fatal_familial_insomnia MESH:D034062 fatal familial INSOMNIA Insomnia, fatal familial FFI DOID:0050433 Insomnia familial fatal familial fatal insomnia OMIM:600072 Fatal familial insomnia (FFI) is a very rare form of prion disease characterized by subacute onset of insomnia showing as a reduced overall sleep time, autonomic dysfunction, and motor disturbances. ICD9:046.72 icd11.foundation:669154658 UMLS:C0206042 Orphanet:466 MEDGEN:104768 NANDO:1200191 NCIT:C84711 MONDO:0010808 MedDRA:10072077 SCTID:83157008 fatal familial insomnia GARD:0006429 ICD10CM:A81.83 NORD:1920 insomnia inherited neurodegenerative disorder