You can adapt to early hours, but you can’t become a morning person. As people age, they do tend to shift their internal clocks earlier, but within the same age

You can adapt to early hours, but you can’t become a morning person. As people age, they do tend to shift their internal clocks earlier, but within the same age cohort relative early/late preferences generally stay the same between people. Internal clocks and circadian rhythms are complex, but are demonstrated to have a biological and even genetic component. Declaring that being a morning person is about “discipline” is like saying being a great basketball player is about “discipline.” Sure, it helps, but at some point genetics and biology take over. I wasn’t a believer on this subject before, but I found the book “Internal Time” incredibly well researched, written, and convincing. https://www.hup.harvard.edu/catalog.php?isbn=9780674975392 https://www.hup.harvard.edu/catalog.php?isbn=9780674975392