I keep an electric oil radiator under the window next to my bed. It has two independently switchable elements, one 600 watt and one 900 watt, and a thermostat - all pretty standard for an inexpensive heater. I really love it as we don't keep the central heat set very high at night and the radiator mitigates the coldness around the old single-pane window. Outside temps can easily get down to the low 30s here at night, but I rarely ever use more than the 600 watt element. One thing I really like about radiators is that they don't get hot enough to catch books, papers, or curtains on fire, so I don't worry about what's around it.
Toggles - now we know why your ex is an ex! I've always heard the phrase "I wouldn't throw him out of bed for cracker crumbs", but peeing in the bed is an entirely different consideration IMO!