Start by reading about the mental effects of sleep deprivation - a problem mostly unknown to pre-agricultural humans. This topic is a hotbed of research, yet th

Start by reading about the mental effects of sleep deprivation - a problem mostly unknown to pre-agricultural humans. This topic is a hotbed of research, yet the one cure which is certain to work - creating opportunities for people to live lives ungoverned by clocks if they so choose - is of course not on the table.