Filou the Abyssinian cannot sleep warm enough. He has also this kind of radiator hammock in the bathroom (where I keep it always warm because I am freezing easily, too) but he also likes cooking on top of the radiator.
And in the night he comes under the covers (only in autumn and winter) and sleeps under my knees -most of the time he uses my husband's knees which is nice of him as I have problems with the resulting "contortionist sleeping" as somebody called it in the other thread that started with Jen's cat pix.