Dear Fellow members, From my limited knowledge, if headboard is near toilet door or sharing same wall with toilet, person sleeping there will be affected if toilet has foul smell emitting from the door. Remedy is to ensure toilet is kept clean, door closed all the time - after all not often we have large room which could avoid this. Next, headboard is sharing wall with toilet, result will be too much water element, affecting the person's health / mind in the long run. There are remedy to minimize the negative effects.