Waking life reactions to dreams
Things like dreaming you are on stage performing, and sleep singing, dreaming you are swimming and flailing your real arms about etc.
I had a dream that I was being chased by a huge blobby purple monster, and I suddenly got all courageous and turned and kicked the monster. Well in real life my leg kicked the wall. Chipped the paint and my toenail too!
I've smacked partners with errant flailing limbs while dreaming (none of them were mad really, just confused when they woke up because I whapped them), I used to talk in my sleep, usually just yelling at my brother or the dog, and apparently I once sang "Sweet Child O' Mine" in my sleep. I think that was my dream that I was on stage in a band.
And of course the ever popular "woke up while orgasming" dream. Unfortunately I seem to have these dreams at the *worst* times. Like spending the night at a friends house, dreaming of having sex with her, and waking myself (and her I think) with my noises. This was in highschool, before I figured myself out really. Apparently I didn't get the sign lol. Years later I figured it out.
Same thing happened when my cousins were visiting from out of state. I had a big bed, so one of them slept in it with me. I woke up moaning and gasping....... *aye*
She was soooo confused! I was mortified, and just rolled over and pretended I was still asleep.