I read an article on BBC News online how sleep patterns were different before the invention of light bulbs and industrialisation. Rather than sleeping continual 8 hours (say from 10-6, 00-8) in times before 19th century people used to go to sleep couple of hours after sundown for 4 hours then wake up for a couple of hours to do some reading, writing, etc. and then go back to sleep for another 4 hours. This way the sleep would keep people energized and the sleep would make their minds fresh, rather than having deep and disturbing dreams.
After industrialisation people started to cut away from this kind of sleeping, and after the invention of light bulbs sleeping seemed to them as a waste of time. They could be awake anytime they wanted – the ones that got money for light bulbs or candles.
http://www.bbc.co.uk/news/magazine-16964783
To investigate time and how to use it without wasting it; time spills and a waste occurs even though how careful one might be.
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