Fatal Familial Insomnia Watchlist (log in to enable) Retrieved 2021-01-23 Source Orphanet Trials — Genes PRNP, C4BPA, CARD14, GLS, ABCB6, PRDX2, RYR2, ZBTB38, MLKL, MPRIP, RIPK3, UQCRC2, SDHB, AQP1, RASA2, TSPO, PRL, NDUFB8, COX2, MDH1, GH1, GFAP, CSNK2A2, CHI3L1, MIR146A Drugs — Interested in hearing about new therapies? Registered! Fatal familial insomnia (FFI) is a very rare form of prion disease (see this term) characterized by subacute onset of insomnia showing as a reduced overall sleep time, autonomic dysfunction, and motor disturbances.