I have a theory the educational process is not a matter of humans expanding our brain's potential, but a process of limiting our potential. Inherent in the process of our neurons "hardwiring" connections as we develop is that other possible connections are not made. Most educational systems could be defined as learning more and more about less and less, until you develop deep but narrow capabilities. Certainly this could be an indictment of many graduate and doctoral processes.
Given that presumption, an inference could be drawn that babies, or in utero fetuses, perhaps have dream experiences not inferior, but rather superior to our own dream experiences, as their dreams are not preoccupied with the clutter many studies have shown affect adult dreaming.
This leads to an interesting ethical dilemma. From a philosophical standpoint, what makes a human a human? An opposable thumb? Not likely. Walking erect? Nope. I'd suggest as a philosophical, spiritual, religious, medical, ethical and legal question, the ability to think, reason, be self-aware, and DREAM may have a lot to say about this question. And if a fetus DREAMS, then I'd suggest that is an attribute of humanity that may entitle a fetus to some sort of representation or due process before their viability is terminated by anyone else, including their parents.