The bedroom should ideally be located in the sector that corresponds to one of your auspicious directions. Each person aligning his or her head to point in the Sheng Chi direction enhances Chi energy. Furthermore, if the door into the bedroom faces the occupant's Sheng Chi direction, powerful Fengshui will be activated. This provides the perfect bedroom orientation and alignment.
Just being able to place your head correctly is excellent. It is seldom practical for everyone in a household to get everything perfect from a Fengshui perspective, but as long as the important orientations are arranged correctly, i.e. according to the four auspicious directions, it is considered as good fengshui from practical point of view.