According to a paper published by M. J. Kotchen at the Yale School of Forestry & Environmental Studies, the most likely effect of DST is to cost us energy. Using data from Indiana when they changed over to DST statewide, residential energy use actually increased overall. From the paper published: We find that DST results in a 1% increase in residentialelectricity demand, and the effect is highly statistically significant. We also find that the effect is not constant through-out the DST period. In particular, DST causes the greatest increase in consumption later in the year, with October estimates ranging from an increase of 2% to nearly 4%. Consistent with Benjamin Franklin’s original conjecture, our simulation results show that DST saves on electricity used for illumination but increases electricity used for heating and cooling. Both the empirical and simulation results suggest that the latter effect is larger than the former. Moreover, we find that DST costs Indiana households an average of $3.29 per year in increased electricity bills, which aggregates to approximately $9 million for the entire state. Finally, the social costs in terms of increased pollution emissions range between $1.7 and $5.5 million per year. The entire text can be found at http://environment.yale.edu/kotchen/pubs/revDSTpaper.pdf Really makes it seem worthwhile to screw up our sleeping habits twice a year, doesn't it?