Scientists from Germany have established the relationship between average incomes in the country and preferences of the people to the conditions for a comfortable sleep. It turned out, the higher the GDP, the more its citizens love the coolness in the bedrooms. According to experts, rich Europeans confirmation.
The average temperature in sleeping residents of Switzerland is just 17.6 degrees. Switzerland ranks first in wealth among the population. In Romania (low GDP) people prefer to sleep in warmer conditions (at 20-21 degrees of heat).
There is another theory. In the developed countries of Europe the price of heating is rather high. Therefore, citizens consume water more rational than people in other countries.