Just an idea...I find that the vaporizer I use from time to time in my kidlets room if they have a cold keeps the room warm. It runs for about 6 hours so you could get one and sneak in a turn it on when you go to bed. I don't like to leave the central heating on as it drys out the air too much and the vaporiser keeps the room warm and the air moist. You do need to open the curtains and open the window in the morning just to get some air circulating through.