Psychology Today | 21.07.2026 05:36
For years, sleep scientists have documented many problems with daylight saving time (DST), which requires changing clocks twice a year. After time changes, incidences of adverse cardiovascular events and mood disorders increase, and the frequency of vehicular crashes rises. Our bodies are entrained by daily light and dark periods, and even the one-hour shift in timing of sunrise and sunset can disrupt the circadian system. Schools and businesses do not adjust start or end times on transitions. Changing the clocks on Sunday is meant to ease the time transition, but one day is not enough time to be effective.
