Why drop Daylight saving time (DST) in the United States? Two reasons:
1. Most studies have shown little to no effect on the energy consumption with DST. The increased demand for "lighting" is actually offset by higher heating & cooling requirements during DST.
http://en.wikipedia.org/wiki/Daylight_saving_time_in_the_United_States
2. Shifting sleep patterns for adults isn't as difficult as shifting sleep for children. Most parents do not look forward to shifting their children(s) sleep patterns twice a year.
Don't think sleep matters? Please read this "Healthy Sleep" study conducted by the Division of Sleep Medicine
at Harvard Medical School and WGBH Educational Foundation:
http://healthysleep.med.harvard.edu/healthy/