We dream to avoid multiple thinking & focus only at one thing :
As our brain can not be at absolute rest(without thinking). Our brain tends to minimize multiplethinking/tasking/functions or tends to focus at one thing during dreaming(this turns out to be the reason for dreaming)
Focusing on one thing not only…

As our brain can not be at absolute rest(without thinking). Our brain tends to minimize multiplethinking/tasking/functions or tends to focus at one thing during dreaming(this turns out to be the reason for dreaming)