how transform a night owl into an early bird?

It is difficult when a night owl need to change the routines and start waking up early. A night owl that almost always went to bed at 2 am now has to go to bed at preferably 11 pm. To be fit for work the next day that is. Last night the night owl fell asleep at midnight and was dead the next morning. Not so nice for a night owl to wake up at 6.30 am for work.