"Early to bed and early to rise makes a man healthy, wealthy, and wise."                      -Benjamin Franklin

It turns out that your "Chronotype" (whether you're a morning bird or a night owl) is roughly 50% determined by genetics, and 50% you can control with good habits.

A Harvard study showed that it doesn't matter how many hours you sleep a night, but what actually matters is that you go to bed and wake up at consistent times.