I had a weird eexperience when I was at school way back in 1956! I boarded at what was once a Priory, which dated back to the 12th century. It was cold (February) and we were all in bed, and I was SO cold and just couldn't get warm, so our dormitory captain offered me her hot water bottle. ( we younger girls weren't allowed to have them??!!) which I gladly accepted, D.C then, as I thought walked from her bed,stopped for a second at the end of my bed and looked at me which I thought was odd, before going to the basin and as I thought started to fill the hwb and then she seemed to sort of disappear. After a few seconds I asked her for the bottle, and she replied, to hang on and that she hadn't even got out of bed yet!! At that moment I began to feel warm again and cancelled the bottle! Who I saw and why goodness knows, I've never had that or any other similar experience before or since and I'm 80 now! But I've never forgotten it.