Overview
- Daylight saving time, which starts overnight Saturday at 2 a.m. when clocks jump to 3 a.m., cuts an hour of sleep and moves more evening light into the months ahead.
- Health evidence is mixed, with the Dutch RIVM reporting a post-switch rise in heart attacks in 2019, while a 2025 U.S. analysis of about 170,000 records found no significant increase, and recent studies link irregular sleep to higher cardiovascular risk.
- Forest rangers warn of roughly 15% to 20% more collisions with deer and other wildlife around the change because the morning commute now overlaps dawn movement, so drivers near woods are urged to slow down and stay alert.
- Sleep specialists advise keeping a steady schedule, setting an alarm on Sunday, dimming screens and other blue light at night, and easing the transition by shifting wake-up times earlier in the days before the change.
- The European Commission’s 2018 bid to end clock changes still lacks agreement across member states, and the Dutch government says there is no clear basis yet to pick permanent summer or winter time.