Intuition can be valuable, but I think we should distinguish opinions from facts. This is something that affects people's health, jobs, and relationships.
Chronotype, sleep phase, and when people actually sleep are related but not the same.
The Wikipedia article and my other comments go into more detail about the research. I singled out delayed sleep phase in adolescence because it's been observed even in other species. It seems counterintuitive that this would be so consistent if there were no reason for it.
Sleep phase shifting with age doesn't make it infinitely pliable. You can influence libido, but the difference between 16 and 60 is mostly biological.
Chronotype, sleep phase, and when people actually sleep are related but not the same.
The Wikipedia article and my other comments go into more detail about the research. I singled out delayed sleep phase in adolescence because it's been observed even in other species. It seems counterintuitive that this would be so consistent if there were no reason for it.
Sleep phase shifting with age doesn't make it infinitely pliable. You can influence libido, but the difference between 16 and 60 is mostly biological.