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Time Change Science: Be Careful Tomorrow!

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Did you remember to move your clocks forward last night? If you live in the United States (as well as many other countries), you did. How will that affect you and other people?

Well, for one thing, you are more likely to suffer a heart attack tomorrow than on any other Monday of the year. Why?

Almost all biochemical, physiological and behavioral functions in any multicellular organism (including humans) fluctuate over the course of a day based on an internal, biological clock, called the circadian rhythm. In the early morning hours, heart rate and blood pressure slowly rise and reach a peak in the morning, at the time when we spontaneously wake up. Then, heart rate and blood pressure level off and slowly rise again throughout the day until reaching their peak in the late afternoon.