Waking up to a temperature swing

Recently I let a friend from high school move in with me. I had been living on my own for six months since I broke things off with my fiance, and while I love living alone, I couldn’t afford it. While we get along just great, I forget how foolish she can be. That’s because she’s never lived on her own until now, but I’ve been on my own since I was 19. I had to learn really quick how to balance the bills and use the central heater enough to keep warm but not so high that I can’t afford the monthly utility bill. When she came home from her shift at work one day, she was complaining that she was cold. So I made her a cup of tea and asked to check the thermostat in her room. Every room it the apartment has its own zone, so I knew it wasn’t that the electric furnace wasn’t heating her own room properly. The climate control read below 50 degrees! I checked the windows for drafts and couldn’t feel a thing, but when I looked around the room the problem became abundantly clear. She had moved all of the furniture around in a way that worked for her, but had covered all of the radiators. I called for her and asked if there was a way we could move things that would work but uncover the radiators. The two of us were in her bedroom for two hours that night, shuffling furniture around till midnight. But when she went to bed that night, her room was no longer so cold. She woke up in the morning and the thermostat was reading the temperature we had set it at.