Most new wiring codes require dedicated circuit(s) for bathrooms. If the lights are dimming excessively, this could be an indication of a loose connection, which is a fire hazard. Have it checked by a qualified electrician - SOON. The service call is cheap, compared with what a fire could do.
run a dedicated gfci line to your bathroom
It could be that the bathroom circuit simply has more on it so the hair dryer is pushing the circuit beyond its limit. In a typical bathroom, properly wired, this would not be the case. But if there are lights on the circuit other than in the bathroom (it would take a lot of lights for this to be a problem), or if there is a source of heat in the bathroom that is on, this may be where your problem is.
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