hi
Bruxism is mostly stress related, though there may be other causes as well. You grind your teeth mostly during your sleep and may feel of tenderness around your jaw.
Next Steps
You do need a night guard for sure but only after visiting a dentist esp an orthodontist can it finally be ruled out if you need only night guard or other interventions are required.
Health Tips
Also, in today's times, stress is taking over our lives. So please try some stress relieving practices as well. Not only is stress a cause of your teeth griiding, it also causes other health problems.