From a fung shui perspective, the incorrect placement of mirrors may create problems. For instance, having a mirror on the ceiling above your bed will result in poor sleep and could lead to arguments between you and your partner.
Likewise, a mirror on the ceiling above a dining table will result in stress and tension when eating and impaired concentration could mar your work if your desk is below a reflective surface.
If a mirror in such a position can't be moved, consider painting over it so that it is no longer reflective. Alternatively, you could stick pictures or wallpaper on to the mirror - anything to stop it reflecting.
You may have heard that hanging a mirror at the foot of your bed is not a problem as long as you don't see yourself reflected when you are lying flat. This is not true because the mirror will still reflect your chi, or energy, when you are moving around while asleep.
Cover or remove such a mirror and you will feel the difference when you wake up in the morning.