Sleep deprivation or changes to circadian rhythm (such as those introduced by daylight savings time, or DST) can hinder the delivery of safe health care. In this analysis of 288,432 malpractice claims between January 1990 and September 2018, researchers found that the spring transition to DST was not associated with higher severity patient safety incidents, but that events occurring during the 7-8 months of DST were more severe compared to the 2-4 months of standard time.