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

Drink until you pass out= no more nightmares

No more dreams at all

Stress will do it. Since you mentioned it, you undoubtedly know the source of the particular stress that's disrupting your sleep pattern.

Address the source and understand why and how it's affecting you and its effect will diminish. Whether or not the stress disappears is not all-important. Compartmentalize it and you'll be good to go.

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.

It's because you're a terrible shithead and your brain is trying to kill itself in the most violent way while you aren't paying attention.

Mark Richt has lost control of your dreams.

Seriously, dont know if you exercise, but a good walk in the evening or a run would help you. Releases stress and increases endorphins.