Editor: Dear BklynGirl,
Remember rug burns? Without being a fly on your wall, it would be hard to say actually what happened in your parents house, but I can tell you that Poly/Cotton sheets will chafe a lot quicker than 100% cotton when a lot of pressure is applied, AND they heat up against the skin as well. SO, it's very possible that this is the culprit. If you were to replicate your nighttime sport at home on cotton sheets and not injure your knees, then you would know for sure. Please let us know what happens. :)
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