When people living in many parts of the world move their clocks forward one hour in the spring in observance of daylight saving time (DST), their bodies’ internal, daily rhythms don’t adjust with them, reports a new study.

The finding suggests that this regular time change–practiced by a quarter of the human population–represents a significant seasonal disruption, raising the possibility that DST may have unintended effects on other aspects of human physiology.

Indeed, “after taking the seasonal adjustment into account, our results show that the human circadian clock does not adjust to the DST transition,” Till Roenneberg said. “This is especially obvious in the late chronotypes in spring when one looks at their daily activity patterns. Essentially, their biological timing stays on standard, winter time, while they have to adjust their social schedules to the advanced clock time throughout the summer.”

DST was struck into law within the context of wars – “safety and security” always rock-solid excuses. Core economic hopes have never achieved any proof in reality.

This year’s extension was supposed to help us in our War on Terror and Fighting Global Warming. Of course, Congress and the faith-based White House haven’t looked at any research since the mid-1970’s.