My girlfriend has had her blood pressure and sugar levels checked and all is normal. However she feels the cold very quickly, even on a hot humid day. Lately when she has been going to be and sleeping under the duvet, she has been perspiring excessively. She is not ill or has a temperature at all. She is very healthy. She says that she feels cold and so cuddles up under the duvet, but when I wake her when I go to bed (if she hasn't woken herself) she a completely wet from perspiration. Is this normal, or something to worry about please?