Stays has shown that week after daylight savings time that heart attacks after the time change. The loss of an hour's sleep may make people more susceptible to an attack, some experts say. When daylight saving time ends in the fall, heart attacks briefly become less frequent than usual.
Researchers have found that DST reduces lethal car crashes and pedestrian strikes. In fact, a study concluded that observing DST year-round would annually prevent about 195 deaths of motor vehicle occupants and about 171 pedestrian fatalities.
Sources:
http://health.usnews.com/health-news/living-well-usn/articles/2012/03/12...