When I used to train martial arts seriously, I often would wake up finding myself executing a joint lock on my pillow or something similar.  I had to move my bed away from the wall to stop me from punching holes in it.  I was always terrified that I would injure my girlfriend at the time, but somehow I seemed to limit myself to inanimate objects.  I stopped training about 10 years ago and haven&#x27;t had a problem since.  Other people have told me it is actually quite common.