How do i stop my teeth from grinding together at night?

Before i go to sleep i notice my teeth grind together, and after i wake up in the morning. Its like its an automatic thing. Sometimes i do it half asleep too but seldomly though. I have noticed that my top molars are worn from it and feel like som of its missing. They feel weird when i slide my tongue across them... show more Before i go to sleep i notice my teeth grind together, and after i wake up in the morning. Its like its an automatic thing. Sometimes i do it half asleep too but seldomly though. I have noticed that my top molars are worn from it and feel like som of its missing. They feel weird when i slide my tongue across them as ive never noticed it before just started noticing it today and the way it feels bothers me. I have no idea why this happens and what i can do to stop or help my teeth.
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