Cullen might have a thing or two to say about the fallacious thinking: if Alistair could control it, it still wouldn't be his fault, as Cullen knows the risks of interrupting someone in a nightmare to bring them back to awareness and elected to assume them. And even if it's uncontrollable... there are things to do that can help.

Quieter:

"It's only been a few hours, Alistair."