My Dad worked swing shift in a Power plant as an operator. I can't think of any of the guys who worked with him who didn't have health problems in their 40s and 50s. They knew it too, screwed up circadian, noise, beat those guys to death, literally.
He that would make his own liberty secure, must guard even his enemy from oppression; for if he violates this duty, he establishes a precedent that will reach to himself.
Thomas Paine
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