We have actually resorted to putting the air-con on in his room - just to keep it at 16 degrees. We then dress him in a singlet & wondersuit + a polar fleece sleepsuit from target. He has flannelette sheets, one cotton blanket (doubled over), one polar fleece blanket (doubled over) + a thin quilt (doubled over). This seems to be doing the trick - he is warm, but not hot. (I sound like tanstar - so many layers ).

I'm thinking about switching to a wool blanket instead (I think this will be warmer) & also getting a warmer sleepsuit. Where can you get 3 TOG suits?