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Due to being a "night owl" myself, I guess I've always been a little doubtful regarding circadian rhythms myself; but your explanation did a great job of boiling it all down to the most significant component parts. Thank you! I really liked your summary!
No need to use quotation marks - it is scientifically confirmed that night owls and early birds exist (among a number of other, less-well-known circadian types). We call them chronotypes, and it's an active field of study. Unfortunately it's not something that I specialize in, so I can't comment too much on it.
However, it is very well acknowledged in the field that modern society is built on an early bird schedule and that completely screws over night owls. (To my memory, night owls tend to score lower on tests, pursue higher education less than early birds, tend to be less promoted and generally less successful than early birds. Inversely, night owls tend to do better in evening classes than early birds.)
Makes sense. As a kid up until 4th grade I used to go to school in the afternoon and I used to have good grades, 5th grade onwards I started going to class very early in the morning, my grades plummeted immediately and I started to hate school.
As a fellow night owl that gets pretty deep into the late night, I've had the idea that it is actually good to have a small percentage of the population awake while most of the others sleep to help keep watch. I don't have any way to prove this, but it's something that I feel makes sense.
I'm pretty sure that's the general hypothesis in the field, but as you might imagine, it'll be very difficult to prove. There was a study done sometime (I don't fully remember when) where researchers collected data on when people go to sleep and when they wake up, and they found that there was a remarkably normal distribution in the population for when people wake up and sleep.
My personal interpretation is that chronotypes (what you call early birds and night owls) are genetic in some way, but I don't specialize in this area, so don't take my word for it