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The world, living in shifts

The general philosophy of living, is to wake up in the morning, work during the day, go back home in the evening and sleep at night.
I guess this origin of this came from the fact that years (hundreds) before, there wasn't much light in the night to really do anything. So humans decided to sleep during then.
Now we have electricity. What if we reversed the concept?
Rather what I was suggesting is, why do not humans live life in a shift? So some people go along with the regular sleep at night, work at day philosophy, and the others start sleeping during the day and work at night?

What are the pros and cons?
One of the main Pro is see is this:
There are a lot of people in the world. Everyone is vying for the same resources at the same time. In this case by resources i mean, same roads, same shops,same restaurants, same internet bandwidth etc. And this usage drops drastically at night. So to make the efficient use of these resources, why not spread the usage during the whole day?

I am sure there are millions of cons to this concept.
But what do you think?

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    Jan 19 2013: No people can adapt to it without problems, according to 10,000 years ago norm ---- Our instincts.
    • Jan 19 2013: Of course, the change would have its own problems..
      People adapt. There are people who already work in shifts, depending on their job requirements.

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