Eating is also a really big factor for the body’s circadian clock. Not sure what your lifestyle is like, but I would try to avoid eating anything when it’s late.

Interestingly enough, autism is also noted to affect the circadian clock, so it seems like medical and psychological conditions can exert an influence too.

And it could be entirely possible that you are simply a night owl. I just find it disingenuous that some people would use the circadian clock as a way to justify poor sleep habits, especially if they have habits that disrupt their circadian clock. It kind of dilutes the struggles of actual night owls