Dreaming of your bed does not carry a good association. If it is a message from waking hours that you should be thinking of your bed, then you could be sick or needing rest. To be sleeping and dreaming of your bed is like a double sleep imagery. It could be a metaphor within another metaphor. This is not good.
In some cultures, it is considered bad luck to place the bed near the bedroom’s door, or have the feet of the sleeper pointed towards the door. Modern architecture designs small bedrooms with limited space for furniture to be arranged according to preference. Sometimes, the position of the bed can not be positioned favorably.
Are you particular about the position of your bed?