Turn off your electric blanket when you aren't in the bed. If you forget, put your electric blanket on a digital timer that turns it on every night right before bed and turns it off every morning right before you wake up.
If you're cold at night, an electric blanket helps keep you warm without heating the entire house. You can program your thermostat to turn itself down overnight and use an electric blanket to warm up the 18 or so square feet that you are actually occupying while you sleep.