Nothing to be ashamed about! I think people definitely are cut out to be either morning or night people. I am definitely a morning person, and in fact, when the kids were small I refused to help them with homework after 9pm because I simply couldn't process information. I was never one of those college students that could pull all-nighters on a paper. I had to go to bed and get up at 3 or 4 and work.
DH is a night person/I'm a morning person. We're probably in bed together 4 hours total.