Monday, June 24, 2013

Invention of Electric bulb changed Human Sleep Pattern

Today I have learned a fascinating fact about how lightbulb change human sleep pattern!


According to History Channel.. 

   The invention of the light bulb not only illuminated the night, but it may have permanently changed human sleep patterns. 
  Prior to the introduction of electric lights, people typically slept an average of 9 hours a night - at least 90 minutes more than then 7 hours or less that is now common. 

                            
Source: Andrews Evan,"11 Innovation that Changed History", Dec18,2012 http://www.history.com/news/history-lists/11-innovations-that-changed-history

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