Can empire in fact bleach their sheets due to their body oil etc? Why do some stain sheets and others don't? My husband and I recently notice that I appear to be bleaching...

My husband and I recently notice that I appear to be bleaching or staining my bed sheets with an outline or imprint of my body. (No, I'm not insensible!)
I am of course rather confused as this has not happen in times gone by and does not seem to occur to my husband on his side of the sheet.
I do not use any bleach or fabric softner on my sheets and enjoy always used alike washing powder minus any problems. My white sheets of course do not show this so call 'outline of my body' but my other coloured sheets have newly started to. For example, my latte coloured sheets have started to resemble a purple sort of colour only where on earth I sleep, and my light blue sheets hold also started to change to a bleached or whitened colour singular where I sleep.
I hold no idea how or why this have started occuring to me all of a sudden? I hold thought of everything new that I could enjoy purchased or changed to my routine / body and can not think of a piece.
Does anyone have any planning or suggestions?
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