12V electric mattress pads are available for overnight warmth. They do not heat as rapidly, or consume as much energy as a typical 110VAC electric blanket, but they do seem to do a good job because they are under you and under the covers as well, where the heat is well trapped. I think mine draws about 6A at 12V = 72W at full power. It has a thermostat control.
Of course that doesn't make the floor any warmer when you get up in the middle of the night to pee.... for that I recommend the Platinum Cat propane heater which is vented, very efficient, and has all the safety features you would want. There are much cheaper catalytic heaters out there, but they are mostly not vented and that can be deadly if you don't crack a window.
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