Although the main reason for the change of the hour is the energy savings, not many studies prove it. Because power consumption is the main from sector of the industry (which usually has artificial light on all day).
And therefore has more social motivation in which people using sunlight spends more time doing activities away from home (which obviously reduces the energy consumption of households) but mostly favors the relationship between people and promotes the activity financial from services from sector. While harm agriculture and other activities that depend on exposure to sunlight.
It is also true that the increase in the afternoon sunlight may be responsible for a decrease in the rate of traffic accidents.
However, there are no objective data showing that enhance health (although it is true that with more daylight hours there are more people practicing sports, so is that this sun exposure causes more diseases and depression when returning to standard time) .
Neither to be reduced the crime rate (since the only thing that gives is a false sense of security, for not having so many hours of darkness).
To this must be added the fact that although many computing devices automatically change the time, errors may occur (particularly when DST rules change depending on the country).
It should also be noted that generally there is a transfer of power consumption from the evening to morning (which usually peaks increases in specific times and increased electricity prices).
ad from the reminder campaing daylight saving time, made by the U.S. govermentin 2001, taken from Wikipedia
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