I personally know a case of trying the "uberman" sleep schedule (aka "da vinci" sleep schedule, or ~30min sleep every four hours, permanently), having tried har

I personally know a case of trying the "uberman" sleep schedule (aka "da vinci" sleep schedule, or ~30min sleep every four hours, permanently), having tried hard but could never completely convert to the schedule, where doing so is one of two strong possible causes of the individual now suffering very debilitating Chronic Fatigue Syndrome and can no longer work regularly despite years of medical tests and efforts.