How it feels like running in a dream

I've tried punching people at school in my dreams.

This is because when you are asleep, your body still receives subconscious sensory input. Your brain is told that you are being pulled down flat on your back (gravity) and that you are unable to move your limps, as if you were Petrificus Totalus-ed (the sheets that are lying snugly on top of you). Your brain then gets extremely confused, because in your dream, you want to run, but in real life, you're in a straitjacket. This is the result.

What is this from?

I've kicked a guy at my school in my dreams once and then I woke up from having kicked a wall

So teue

True

i always fall down when i try to run in a dream

Holy shit... So I'm not the only one??

You kidding? In my dreams I just randomly lose my balance and can't stand back up or I spontaneously wet myself.