I grind and clench my teeth when I sleep

Hi guys I hope people see this. Lately I’ve been clenching and grinding my teeth when I sleep uncontrollably, i don’t take medicine or nothing. I’m healthy, and I don’t smoke. I’ve done drugs but it’s been 4 months since I’ve touched anything and it wasn’t on high doses or anything life threatening. My teeth are hurting to the point I can’t eat chips only soft foods.. anyone know what causes this?