Ah-Ha!

Time change could prove hazardous to your health | Viewpoints, Outlook | Chron.com - Houston Chronicle: "Although daylight-saving time was sold politically as an energy-conservation measure, it does no such thing. Studies conducted in Indiana prior to 2006, when that state operated under three different time regimes, show either no difference in energy consumption or a small increase in power usage during the months after clocks were moved one hour ahead."