Here's the answer to teaching responsibility.
Be a role model yourself, but don't penalize your students for behavior or neurology.
(Every class I've ever taught for faculty, and I teach about four a year, there's always faculty members late. The hypocrisy is acute)
Great comment by a faculty member "Deborah" who told NineShift her honor students say they won't have to show up on time, or even show up. Listen to your honor students, Deborah, they are your brightest students and they know what they are talking about.
In the 21st century, no one will behave "responsibly," at least not in outdated 20th century behavioral terms. What will be the principle value of the 21st century? Tell us your thoughts.