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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