According to a report in the Journal of General Internal Medicine, the number of human mistakes increased by almost 20 percent after losing an hour from daylight savings. Researchers used eight years' worth of data to study errors that occurred in the seven days before and after the spring and fall time changes. Most of the errors involved drug errors. In the days after switching to daylight saving time in the spring, health care workers may make more mistakes. Voluntary reporting of any patient safety-related incidents that could be caused by defective systems, human error, or equipment error is encouraged by The Mayo Clinic Health System.