Do you have an old bed sheet that has seen better days, which you are considering throwing away?
Don't throw it away?
Recycle it.
Change it into a body pillow.
Do you intend to throw that soft, comfortable bed sheet because it has little tears, stains or holes in it?
Keep it.
You can use that as stuffing for your body pillow.
Before you start, have both bed sheets bleached, washed and dry to ensure you have totally clean materials to start with.
Then take best looking old bed sheet and fold it in half lengthwise, and half across width, so you have a rectangle a quarter of size of original bedsheet. When you fold bed sheet, hide defects in folds so rectangle you get would show no stains or tears.
Iron this rectangle flat. Pay attention to sides. Then sew down 3 open edges. You should have a nice rectangle that stays put without any openings.