Yup, same problem. I cracked all 2 of my crowns in my sleep clenching my teeth. Worst part is that whenever this happens im fully aware and feel it. I cant open my mouth, cant wake up, just a prisoner in my own body. All I remember is me panicking on the inside trying to unclench because it feels like ill shatter my teeth if i dont.

EDIT: Forgot to mention I also panic about loosing my tongue, cause if it were to be outside my mouth for whatever reason, id be missing a good chunk of it by now.