There’s a case study [here](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1781276/) on someone who tried tons of different methods of treating FFI. Fascinating read.
It looks like at some point anesthesia was used and it did work to some degree, though I’m not sure if it sas the same types for typical general anesthesia.
Interestingly, taking stimulants upon waking seemed to help a great deal in that the subject felt better while awake and was able to sleep more reliably due to the rebound when the stimulants wore off.
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