Hi Blackbird,
Just had a thought, it would be a good idea to find out, before you went into the room, whether the usual carers are in the room at that time. could be that you are in there when the team break reliever is there. I totally understand you would not feel happy about someone not being "warm" so you would need to know whether the staff who are in there are going to be the main ones caring for your little man.
good luck.