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@giflian Basically there's a medical disadvantage to teenagers waking up before dawn more often.
But I don't think the people who are really worried about that really considered the other side, which is the consequences of teenagers needing to spend effectively 100% of sunlight hours in school.
@giflian It's a trade off between getting noon accurate and getting extra daylight in the winter.
Permanent standard time has a more accurate noon, which there's some evidence is better for natural sleep.
But also this is Canada, so we can't really afford to give up an hour of extra daylight in the winter.
