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xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
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Look into cancer risks for people working nights, there's more to it than vitamin D and there's long term sleep issues that come with working nights for years, even after going back to a day schedule.
I thought what you meant was people switching to work from something like 2am to 10am, 5 or 6 am to 1 or 2pm is perfectly feasible and not that unusual (especially 6am to 2pm).