Michael is interested in hot water bottles. For a long time, he would insist on a bottle filled with cold water to take to bed with him. He would cradle it in his arms and murmur affectionately to it, “Coldy, coldy.” Recently, my mother gave him a hot water bottle with a cover and he has started to take this to bed with him filled with hot water. For reasons best known to himself, he puts it under his head rather than under his feet.