Do you sleep with 1 arm under your pillow? I do and the exact same thing happened to me a while ago. I found it got better when i got a bigger pillow and slept on my side a bit more without putting my arm under my pillow. I know it sounds kinda weird but I have a friend and the same thing happened to him.
I took a few days off training, then skipped shoulder day for a week or two and everything was back to normal.
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