Our expert says:
One doesn't need a subconscious to have such an experience. Nightmares and just bad dreams can include talking or screaming, without one necessarily remembering anything of the dream content. And maybe more likely after a frightening event like the car accident. SO yes, probably a manifestation of stress through sleep. If the jaw clenching continues and worsens ( though it will probably fade away ) some specialist dentists and some psychologists are interested in treating Bruxism ( which is the posh name for tooth grinding.
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