How this page evolved

Every published version is kept. Each entry shows what changed and why. Earlier versions can be restored by moderators, but only if the material they rely on is still available.

1. Revision 3Oct 4, 2026, 4:04 PMLiveAI-organised, reviewed

   Added newer evidence: an English cohort study finding fewer cardiovascular, sleep and mental-health events after the autumn change and little change after spring; an Australian survey finding no sleep or health impairment in DST states; and social-media sentiment data showing negative reactions to both changes, stronger in autumn. Revised the finding, uncertainty, takeaways and guidance to reflect this more mixed picture.

   • · The main finding was rewritten.
   • · Updated “Cardiovascular events and mortality”.
   • · Updated “Sleep and circadian effects”.
   • · Updated “Mental health and neuropsychological effects”.
   • · 3 new sources cited.
   • · The note on uncertainty changed.
   • · The key takeaways were revised.
   • · 1 new piece of guidance for specific situations.
2. Revision 2Oct 3, 2026, 6:16 PMAI-organised, reviewed

   AI-prepared Starting Map from live research.

   • · First published version.