We don't just lose an hour of sleep when the clocks change for daylight saving time. We lose real money, too.

That's the conclusion of a new survey by SleepBetter.org, which asked researchers to analyze evidence showing the economic drawbacks of daylight saving time.

As the basis of their research, the economists focused on three main areas. First, medical studies have shown that losing an hour of sleep leads to more heart attacks. Second, sleep deprivation has been linked to more workplace injuries in the mining and construction business. And finally, it causes a bit more loafing around at work.

SleepBetter.org has developed what it calls the "Lost Hour" economic index showing that moving the clock ahead Sunday will produce a $434 million hit to the U.S. economy. The company looked at how individual U.S. cities were affected as well.

• The high cost of daylight saving time

At the top of the list is Morgantown, W.Va., a city with higher rates of heart attacks and, historically, a higher rate of mining and construction accidents. Two other West Virginia regions rounded out the top three for similar reasons. Florida cities also appear on the list, mostly because of higher heart-attack rates linked to the large population of retirees in the state.

Here are the rest of the top 20 areas hurt economically by daylight saving time, according to the index:

                   Region                                                    Total cost             Per-capita cost

More on moneyNOW

• Miller Lite goes all out to stop the leakage

• 9 ways the US wasted taxpayer money in Iraq

• This rally has the bears feeling sheepish