Naming the Nightmares

I’ve already talked a bit about the Nightmares, violent demonic creatures that appears from thin air and attack any Angellus unfortunate enough to be nearby.  But why are they called Nightmares?

I can’t remember if the name came up in my original dream or not, but I did decide on it very early.  It fit their “nightmarish” appearance and behavior.  It’s also very suitable considering how they appear and disappear in moments without leaving behind a single trace, almost as if they were nothing but a bad dream…