The Conversation asks: What do we know about the real-life effects of the one hour of sleep loss that most of us experience on the same weekend each year due to daylight saving?

A “daylight saving anomaly” has been described in international financial markets. According to a well-known study published in 2000, stock market returns were negatively affected in the weeks after both the change to and from daylight saving time. “In the United States alone,” they concluded, “the daylight saving effect implies a one-day loss of $31 billion on the NYSE, AMEX and NASDAQ indexes.”