What on earths going on I don’t know. Started a few months ago when 3 nights on the trot I suddenly clamped my jaw together in my sleep / half asleep state and nearly bit the end of my bloody tongue off ! It’s happened a few times since although last night it was more that I kept becoming aware that I had clenched my jaw together but not bitten my tongue just clenched my teeth, about 4 times it woke me up. I’ve got a sore tooth / mouth at the moment so it hurt !