While considering each individual's best sleeping direction and avoiding his or her "Lonely Pillow" direction. (Both are determined by your year of birth in relation to your gender.) There are several environmental factors to consider when choosing the position of your bed, such as:

Large MIRRORS - aren't recommended in the bedroom, because they aren't conducive to a restful nights sleep. Mirrors reflect light... light is Yang Qi, which is active energy. By reflecting light mirrors stir-up the Qi in the bedroom, where you want the Qi to be more Yin / still and restful. Besides, mirrors could reflect your bedroom activities to the neighbor. This wouldn't create a feeling of security and safety in the bedroom. Plus, if the mirror is in your "Lonely Pillow" direction, it will cause you to be single.

Headboard against a wall! The wall provides stillness of energy to provide a restful nights sleep. You want the Qi to be still at top of your head. If you angle your bed in a corner, there will be too much movement in the Qi at the top of your head for you to have a good night