I don't think we can easily change our body clocks, and we probably don't know why many of us are geared to be morning or night people. Fortunately, my wife and I were the same. If I could really choose which to be, I would stick with being a morning person. The man was here at 8 AM to mow today. Later this month I have early morning (fasting) blood work and an early doctor visit 3 days later.
My best friend and emergency contact is a night person. I have a check-in service I call every morning to let them know I made it through the night. I have to be very careful and not forget or by 9 AM they will call him.
He's a nice person, but a bear if he gets a call before 10:30 AM.