A few years ago I learned that Balmoral Castle – the vacation home of the British Royal Family – has no central heating. So to stay warm on those cold Scottish nights they sleep with a hot water bottle. So do I!!
On cold nights in Milwaukee, I use two hot water bottles. The first one goes down by my feet and the second one is clutched to my chest like a teddy bear. I sleep nice and warm, while the rest of my empty apartment freezes. Zzzzz.
Total Cost: About $0.25 to heat the water give myself the royal treatment.