You may have come across the kua number or eight mansions formulas, whereby people are divided into two groups depending on their year of birth. Those born in the east group benefit when they face east, north, south or southeast. Those in the west group should orient themselves towards the southwest, northeast, northwest or west. A person's head should point in a direction that is beneficial to them while they are sleeping. But does this mean spouses or partners who belong to different groups should sleep with their heads at opposite ends of the bed? Or even in separate rooms? No: what is more important is that you sleep with your head against a wall and that you do not have a window above you. You should also not have a toilet door on the wall behind your head or sleep with your feet pointing towards the entrance to the bedroom or a toilet door. Some fung shui masters use the data from your time and day of birth to determine which element is suitable for you and thus the corresponding direction. Of course, environmental features are also required to determine the overall layout of a bedroom.