If anyone knows they grind or clench their mouth at night, it is URGENT (take it from someone who went through so much pain I was often crying into my pillow - not a normal guy thing - and wanting to die) that you see a dentist and have them evaluate the wear and tear on your teeth, and discuss the possibility of TMJ damage with them.
Grinding and clenching is the number one way you get TMJ. It builds up year after year without you realizing the damage you are doing. Then suddenly, (like me) you will be eating one night and your jaw begins to pop, and you have great pain and find to your horror that you cannot open or close your jaw.
Don't be glib about your teeth and jaw. It's like pouring a steaming pot of black coffee into your gut as an IBS person.