For me, it seems to be largely a matter of environment. In my current environment, I find more peace and quiet and escape from worry in the evening/night. Als

For me, it seems to be largely a matter of environment. In my current environment, I find more peace and quiet and escape from worry in the evening/night. Also, I currently have some health issues that often mitigate somewhat -- slowly -- through the day. (My current environment seems to exacerbate them.) Countering this is a tiredness that hits with sunset. When I'm somewhere else -- and also with other activities at hand -- being a morning person is not a problem. So, my suggestion: Don't just look at yourself and/or your psychology. Evaluate what other factors may be influencing this.