Personally, I'd rather have the guy next to me in a shelter wake up screaming, where I could see it was just a nightmare, than someone in a tent I couldn't see scream at 2 in the morning, and wonder if this is a scene from Deliverance for the rest of the night. If said guy warns us before hand, then it's even better. However, if he warns us, then goes and sleeps in a tent, I still wouldn't know if he's just having a bad dream, or if there's a deranged axman trying to cut his way into his tent. Having a hyper-active imagination, I'm more inclined to go investigate to set my mind at ease, than to try to convince myself that it was just "that guy with the night terrors."
I hope he does alright, and is he reading this thread..?