I grind my teeth sometimes

In my sleep. I rarely catch myself doing it but sometimes I wake up and I feel like I can tell from my jaw and teeth that I was doing it. This pro runner Geordie Beamish sleeps with something called "mouth tape" where he puts duct tape over his mouth. I guess so he only breathes through his nose. But I wonder if it could also be a cue to relax my jaw. 

Haha maybe I'll try out mouth tape.