Overview
- Clocks in most of the United States move back one hour at 2 a.m. Sunday, repeating the 1 a.m. hour, with Hawaii and Arizona not observing the change.
- Under federal law, states may adopt year‑round standard time but cannot enact permanent daylight saving time without congressional approval.
- California voters passed Proposition 7 in 2018 to allow lawmakers to set a permanent schedule, yet a 2024 bill to adopt year‑round standard time stalled in committee this session.
- Sleep specialists emphasize morning light exposure and gradual adjustments to ease the transition, as the National Sleep Foundation advises relaxation and napping strategies.
- A Stanford modeling study projected health gains under a fixed time policy, with larger benefits from permanent standard time than permanent daylight time, and a 1974–75 year‑round DST trial was reversed over safety concerns.