re: What's up with having all these crazy realistic nightmares?

I have a recurring theme in my nightmares, that I figure I'll share because this stuff interests me at least moderately.

Most of my nightmares revolve around post-apocalyptic landscapes (obviously rife with danger, needn't be said but I will) and the theme, generally, is a place of safety while witnessing chaos. Usually from a high point, where I'm just close enough to be in danger but at least feel somewhat secure.

I've had this 'nightmare' ever since I got out of the Navy and I probably have the same one once or twice a week since.

High in a building, deep underground, massive mansion with one wing under some form of agent trying to work its way in.