Karen always ground her teeth when she slept (She also spoke in a language that I could never identify when she slept, and she spoke no other languages when she was awake beside English??).
Karen found that you can get 'Night Gards' for ~$30 where the sell the stuff like toothpaste. She then found that you can get the *exact* same thing for $1 in the Sporting Goods section for boxing/football 'Mouth Gard'. Always frugal she'd buy them in bulk from EBay or Amazon. She went through about two a month.
~~DISCUSSION~~