I used to think I was the same, but I realised (embarrassingly slowly), that every time I went camping/hiking away from artificial light I would just go to a natural sleep cycle. It was artificial stimulation all along, I wasn't really a night owl.
And this sounds ridiculously lazy to physical workers, and even to my former self, when I woke up at 4.30 in Australia to cut the first trees at 6:00 ;) That was the only moment of my life where I wasn’t depressed. Maybe this blue light has a very palpable effect on sleep cycles and depression, after all.