I could see it having to do with what's going through your subconscious when you sleep. You could be clenching your jaw extremely tight or tensing up in your sleep and not even knowing it. Dentist noticed a difference in my bite and realized I was grinding my teeth and wasn't aware of it. It started during the time my mother in law was dying of cancer.
I recommend meditation or try out one of those float tanks once. It makes a big difference in stress, I can assure you.
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