I think that is a towel and not a pillow. She is drying her hair.

Well, the image was titled "good morning" in Japanese, so I don't know.

this pic is a rendering of a graphis idol photo, I believe
though I don't remember the idol's name, I do remember to have seen the series of pictures, all about getting out of bed (more or less). And yes, pillows (not towels) played quite a role (as did coffee and other morning related things).