The real difference is in the direction that the heat comes from. Some people prefer to have the lightweight warmth of a warming blanket OVER their bodies. Others prefer the warmth of a mattress pad UNDERNEATH them.
They certainly can. You can simply turn down the thermostat at night and heat only your bed instead of the entire house.
Our wiring system employs a patented carbon-based polymer Positive Temperature Coefficient (PTC) sensing capability to provide more uniform heat.