No, there was no need to explain. Ronan was overly familiar with nightmares, and especially his particular brand of nightmares - which were so much more real, so much more dangerous than most people's were. When most people considered the glory of what it would be like to be able to take anything you wanted out of your dreams, they did not consider what that meant for nightmares.
He still remembered his night horrors, before he'd been able to control them; they had cut and sliced into his skin, killed him so many times in his dreams. Only once had he brought the injuries back.
He doubted that the icy cold of his presence would help, but he sat down on the bed next to Noah anyway.
"It's not real," he told Noah, hovering nearby. "I know it feels real, but nothing in your nightmares can actually hurt you unless bring the injuries back with you."