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What's marginal? From the article:

> Places that have already pushed back school start times have repeatedly seen positive results. When Seattle’s public-school district shifted its start time in 2016 (from 7:50 a.m. to 8:45 a.m.), students got a median of an additional 34 minutes of sleep a night as a result. And in Cherry Creek, a Denver-area suburb, high schoolers slept about 45 minutes longer on average, and those improvements endured even two years after the change.

34 extra minutes of sleep on 55 is pretty good IMO.



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