What really affected me with Egwene's dreamwalking is that this is a woman who has lost a bit of herself and her connection to others due to trauma. She uses Tel'aran'rhiod to reach out to her loved ones, whether they are physically or emotionally cut off from her. They cannot see or hear her though, so Egwene is haunting them, content in seeing them at peace again. In turn, we see through the characters' dream that sleep is the space where we can find again those we lost, those who are far away from us, those we will lose, even those we can never be.
Sleep becomes the last refuge from grief. Unlike memories it is a world in its own right where the people we lost persist and where we can meet them.
And that might be one of the truest, kindest depictions of grief I've seen recently.