I've heard a few rationalities. Most of them center around having more light in the evening to play with, or less in the morning to wake you up. (Who wants sunrise at 4 am when you have to sleep until 7?)
The "saves electricity" argument does work. You turn your lights on when it's dark, no matter what the clock says. However, you go to sleep at the same *hour*, no matter what the lighting situation is, because you (generically) have to be at work at 9 am the next morning. If fewer of those evening hours need to be lit, you save energy.
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The "saves electricity" argument does work. You turn your lights on when it's dark, no matter what the clock says. However, you go to sleep at the same *hour*, no matter what the lighting situation is, because you (generically) have to be at work at 9 am the next morning. If fewer of those evening hours need to be lit, you save energy.
One interesting link: http://webexhibits.org/daylightsaving/c.html