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There's evidence that accident rates and health issues increase by a significant margin right after the clock change that causes a reduction of night sleep by 1h. The book "Why We Sleep" makes a really good argument about it all, and is a generally great book.

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All the comments ignore the fact that until the industrial revolution people didn't sleeps a solid 8 hours a night, as in the past people used to practice polyphasic sleep. People used get up in the middle of night a socialise for a few hours before having their second sleep.

Most people have complete control over when they go to bed, as they choose a particular time to go to bed.

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