HMMMM
I don't know what you mean about dreams being null and void.
Some dreams are nothing more than mental sorting, processing at night evidently.
Some are messages from satan.
Some are messages from God.
It helps to be able to discern the difference.
We have a lot of ideas about what is going on with dreams, some ideas from quantum mechanics and others from metaphysics. Most of us do not have enough control over our dreams to say much about them. Those who do have control over their dreams wouldn't be saying much. It can get into whether someone believes the mind is simply something the brain does--most people, especially scientists--or whether mind is present everywhere. It's fascinating to speculate, but to pay attention to someone's dream just because it was memorable is not something we need to do. If Alqaida wants to do battle in the realm of dreams, they are more than welcome to give it a try, but there is no sign they are especially adept at it.