I understand what you mean, I get like that sometimes, its stupid & recently ive apparently been frowning in my sleep. LOL.
So i think it happens when i'm asleep as well.
I dont know exactly what to suggest that might help.
Maybe do something calming just before you go to bed, like have a nice warm drink, get comfy in bed with a good film and a waterbottle.
Something not too stressful & that can clear your mine of most things.
Take care of yourself.
Ambs
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