Well, they certainly were mixed up with nightmares in the old legends, so I don't think it's impossible. The fact that he is in RMMH now, though, makes it less likely. I know that demons can't mess with people's heads on hospital grounds, it seems unlikely that an incubus could send a nightmare from hospital grounds to you.
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Date: 2014-10-07 11:16 am (UTC)I can ask Peter to be sure.