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Nowhere do they indicate a 'permanent jet lag', it feels like their open letter has been misconstrued, I assume this is to get a catchy headline? It's a short, easy to read open letter and I was able to understand what they're saying.

They are calling on switching to Standard Time instead of Daylight Saving Time. There can be adverse long term effects of switching to DST as opposed to ST. And finally the reference to jetlag is in the context of _social jetlag_

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I don't know what "social jetlag" is, but the 'lag' in jet lag is the latency between a newly imposed sleep schedule and the body's circadian rhythms. You can't have a permanent "lag" - any "lag" effects will be gone within at most a week or two. Whatever the pros and cons of DST, "jet lag" is not the right way to describe them.

"It will be permanent jet lag," said Myriam Juda, a researcher at Simon Fraser University's Circadian Rhythms and Sleep Lab...

But yes, it's meant figuratively or in the social jetlag sense.

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