Its a matter of common sense, with the onus on the flight crew member to achieve the best solution for his/her self, as everyone has different biorhythmns (spellcheck?). If it were me, I would go to bed late the night before, sleep in in the morning, and then nap in the afternoon to build up a sleep credit before starting the job.
It is a personal responsibility to make sure that you are fit to fly from a fatigue point of view, just as it is from a health point of view.