Early risers; late risers

Human day is always out of sync with Earth's day. What if your day is less than 24 hours - just 23 hours. You will get your daily first dose of adrenaline one hour early - as a way for the body to sync to its rhythm. Thus you would rise early. In day time, earth will try to sync you to its cycle. And it is a tug-of-war between you and earth.