What is so idiotic is the concept of a natural circadian rhythm that is being claimed out of correlation studies of social cohorts, when there is no fundamental

What is so idiotic is the concept of a natural circadian rhythm that is being claimed out of correlation studies of social cohorts, when there is no fundamental hypothesis to support the idea that young/old people have innately different rhythms. I agree with you that people do not perform when their rhythms are not in sync with their lives’ demands. However commenters and the article writers are inferring there is some inherent trait that prevents their body clock from adapting.