1. United States
2. Calif.
3. Letter

I understand the house has passed the Sunshine Act. The scientific case against permanent DST has become increasingly strong: • Morning light is the most powerful signal for synchronizing the human circadian clock. • Permanent DST delays sunrise for much of the year, especially in winter, reducing exposure to morning light when our brains need it most. • Later sunrises are associated with chronic circadian misalignment, sleep loss, poorer mood, reduced alertness, and increased cardiometabolic risk. • Studies comparing western versus eastern portions of time zones consistently show worse health outcomes where people experience later sunrises despite sharing the same clock time. • The American Academy of Sleep Medicine and numerous sleep and circadian experts recommend permanent Standard Time, not permanent DST, as the option that best aligns with human biology. The argument for permanent DST is largely one of convenience and preference for lighter evenings. The argument for permanent Standard Time is one of physiology and public health. I prefer the Standard Time and hope you vote NO on this DST proposal.