Hi Doc, I am have this issue. When I sleep with fan blowing constantly at me. There came a point when I feel very cold till it reaches my bones and my whole body shivers badly. I had to cover my self with blanket and my body will slowly warm up. This happens ranomly(different days in a month) when i sleep at night.And I remember I only felt this kind of symptoms when I was very sick like having very bad flu . I am concern this unusual cold means anything?