I used to think I was a night owl. I didn’t realize how unhealthy I was at the time, other than a slight issue here and there. It wasn’t until I got myself on a good track with medications, a CPAP, and etc that I mysteriously switched to being fully awake in the daytime. I actually wake up on my own without ever setting an alarm. Of course the opposite of that is when the sun goes down my body starts pushing me to bed lol.