That means you either have peaceful souls of children that are just near you and it isnt a bad thing. It just means life is eternal and mysterious. Alternatively its just a traumatic experience has poured over into your dreams which is slipping into waking time as well. The brain can see things when we're awake just like dreaming. Either way it is okay.

I am truly sorry for your loss. I know that people can be unintentionally cruel and not understand that a child lost through miscarriage is still a human being, and that the parents do not mourn any less. I know directly just two people who have dealt with this tragedy, and their mourning was just as keen years later, along with bitterness at the callousness of other people who did not comprehend.