From: http://www.cnn.com/2014/10/24/opinion/yates-daylight-saving-time/:
The U.S. Department of Energy issued a report in 2008 that examined the impact of extended Daylight Saving Time. A four-week extension would save approximately 0.5% of electricity per day for the country. Put in perspective, it's enough energy to power 100,000 households for a year.
The second strong case for staying in Daylight Saving Time year round is that we can save lives. A recent study shows the switching of clocks in the spring causes a 25% jump in heart attacks in the few days following the switch, confirming earlier research that point out the shift in time can disrupt the quality of sleep and biological rhythms.
Many other reasons can be found to stop this outdated practice. Stop changing the time!