Rise and shine!  A new study suggests there's a link between a serious medical episode and the time of day it occurs.

FOX's Colleen Cappon reports in today's "Housecall for Health":

A new study says that heart attacks are more likely to happen in the morning and tend to be more severe than those that occur later in the day.  Researchers at Baylor College of Medicine in Houston found that between 1-5am, heart attack risk is six times higher than in the afternoon.

The reason is partly due to the stress of heading to work, but also higher levels of a protein called KFL15 that leads to ventricular fibrillation.

Housecall for Health, I'm Colleen Cappon, FOX News Radio.