I think most night owls aren't as night-owly as they think- they just don't have a consistent and healthy routine. Very few actually have a diagnosed sleep disorder, just poor habits. I was able to program myself to be a morning person with very little up-front effort.

Anecdotal but I used to be a night owl and now I've risen at 5am every workday for the past two years. On off days I just set my alarm to go off 7 hours after my head hits the pillow which is only an hour or so later than usual anyway.

Just have a routine, any routine.