0 I sleep with a blanket under my head. I can fold it as many times as I need to change the height. I can sleep well sideways without having the pillow right in my face like with soft pillows. Also doubles as a eyemask when there is to much light bordering me.
I mean the person that is taking in the blood has already lost blood and the plastic within as a prerequisite. So, at the end, they should stay within the same amount of blood plastic as before.