There is a proof for this - when you're dreaming and hear some noise that wakes you up, in many cases the plot of your dream in last second or so will be constr

There is a proof for this - when you're dreaming and hear some noise that wakes you up, in many cases the plot of your dream in last second or so will be constructed around that sound - in other words, your brain would have to know the future if it was all realtime, it leaks out faking reality perception.