I remember thinking about this quite a while back, the concept, but it looks like it's true.
i was thinking that maybe that dream is like real life but instead the actions are all happening in your head, and as the video stated action and mental take the same neuron pattern to do.
So my theory a bit correct i guess, that dreams are what the video said, actions but mentally while a sleep and some might accidentally while asleep and half a wake might trigger both at same time and bam who you move your hands.
i remember sleeping on the bus, and i remember hitting a tennis ball with back hand serve and guess it happened in real life as in while i was asleep i wacked this guy next to me, so i was back hand serving with my mental while it also made my hand do similar actions.
this is an intriguing topic.