Adidas Slapped Me Last Night!

I always get complain from my family member that when I'm sleeping, I will crunch my teeth and make a unbearable sound. To cure this, in a traditional way is to take the person own shoe(whateva shoe) to slap on the face when the crunching sound starts. That is what my grandma told me. Last time my sis have it too, it's cure! also by this method. So since this few night I'm sleeping with my mummy, my mummy decided to use my adidas for the Slapping thing! Every time my mum slaps me I wake, so what was the deal? It won't work if I know that someone is slapping me to cure it. haha I get 5 slap each time and 4 times in the whole night. I just hope it works. I wanna git rid of it, I don't wan my future husband to be annoyed by this freaky sound haha.