Above is the circadian rhythm in simple terms. The research studies are interesting. When volunteers were put into rooms without any external cues, they automatically went into a 25 hour cycle.
30% of people have a biorythm that starts an average of four hours later. The so called night owls. For whatever reason they are at the most alert in the evening and early morning hours. This remains the case ones whole life. People used to believe that individuals who were not up with the birds were somehow lazy when that is obviously not the case. It's simply a matter of one's individual genetics and can't be changed. The myth persists however.
Marcel Proust was among one of the most famous. He was up all night writing. Many lawyers end up in that profession because they can study and prepare the cases at night. There are employers who are starting to offer later shifts at night because people who have that difference are more productive as a result. There is additional research that they may be more intelligent but that may simply be due to the fact that there are less distractions in the evening.
Health problems occur when people are forced to be up earlier than they can be simply because the majority of society runs nine to five.
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