Daylight Saving Time Can Affect Your Health?

Daylight saving time, which began this week in most of the United States, has long been promoted as a way to save energy. Whether it does is still a matter of debate. But it does seem clear from studies that a one-hour time adjustment can have unintended health consequences.

It seems that when the clock is moved forward or back one hour, the body’s internal clock — its circadian rhythm, which uses daylight to stay in tune with its environment — does not adjust. In a study of 55,000 people, for example, scientists found that on days off from work, subjects tended to sleep on standard time, not daylight time: their waking hour followed the seasonal progression of dawn.