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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