-> Perhaps just those in your circle of influence. Business commerce requires 
-> somebody to be awake during day. 
  
Not if nobody else is awake during the day. 
  
->  SR> and many people goes to sleep late in the night, past midnight. 
 
-> After missing many hours of their sleep, how do they get to work by 
-> 6am? 
  
They siesta. Traditionally, Spaniards sleep for five or six hours 
during the night, after midnight, and sleep again for a couple of 
hours' "siesta" during the hottest time of the day, in the afternoon. 
In total, they get sufficient sleep, and they seem to become accustomed 
to this rhythm. 
  
                             dow 
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