Bam! Kapow! Slap! - Both the mister and I have hit the other while sleeping. I smacked him in the shoulder last night waking up us both. He admitted to punching me in the back a couple weeks ago. He was very surprised I didn't wake up.
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He also does this really fast kicking thing that has resulted in the dog getting down from the bed in disgust, launching a cat into the closet door and me scooting as far away as I can get and still be in the same bed. We've both also been known to sleepwalk and I wonder if it's related.
Have you/do you ever hit your sleeping partner while you're asleep?