I am living proof that it's possible to change from a night owl to an early riser. I used to stay up till midnight or 1am as often as not. By nature? and lifelong habit, for over 40 years I was in the "stay up late, sleep in to compensate" camp. But a couple years ago someone I respect and admire challenged me to reset the pattern. I started setting a daily alarm and jumping into a brief ice-cold shower at 5am. It only took a few days to acclimate, and nearly everything about my days changed for the better. I need 7h of sleep so if I'm not lights-out by 10p, I "sleep in" to 530 or 6. I recommend it highly. The time I spend between 5-7a is, almost without exception, much better spent than 10p-12a would ever have been. YMMV but my point is, being a "morning person" can be a choice.