I’m surprised no one on here has mentioned CO2 levels yet. A simple CO2 monitor will tell you if your ambient co2levels are too high. Modern, newer homes are like sealed boxes and high levels can exacerbate breathing issues and by extension, bruxism problems.

I was waking up with headaches after moving into a new apartment. When I first got and plugged in a monitor the alarm went off because the ambient air was >3000ppm. Now that I’ve correct the issue with airflow, I sleep better and don’t wake up with headaches.