If you rent you might make your landlord aware of these tips.
Turn down your thermostat. For every degree you lower your heat in the 60-degree to 70-degree range, you'll save up to 5% on heating costs. Wear warm clothing and set your thermostat to 68 degrees or lower during the day and evening, health permitting. Set the thermostat back to 55 degrees or off at night or when leaving home for an extended time saving 5-20 percent of your heating costs (heat pumps should only be set back five degrees to prevent unneeded use of backup strip heating).
more tips>> http://www.consumerenergycenter.org/flex/tips.html#investments
Some additional tips of my own..
Buy a parabolic electric heater which you can aim right to where you are sitting or working or sleeping. It focuses the heat on you.!
Wear a hat. Lots of heat escapes through your head, depending on how long your hair is..
Wear long johns-duh
Drink LOTS of hot drinks like tea. Turn your belly into a heat source!