2min chapter

Plain English with Derek Thompson cover image

The Most Important Thing Most Americans Misunderstand About Insomnia

Plain English with Derek Thompson

CHAPTER

The Evolution of the Circadian Rhythm

Is there a scientific explanation for why our circadian rhythm thinks of the day as being 24.3 hours long when obviously the day is 24 hours long? "I don't think we have a really good answer for this, but I mean, we can always speculate on a sort of evolutionary level," he says. Younger people tend to have longer and later rhythms; older people tend to be night owls.

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