So here's mine. Had it last night and was inspired to create a thread on it so I may have a record of it.
So in my dream I'm living in some kind of vertical mansion. Instead of 3 huge floors, there are like 6 floors but each one has the square foot of an average american suburban home. Or european home. Not that big is my point.
Now, its vertical because it's basically like this but wayy higher:
http://www.google.com/imgres?imgurl=http://www.istockphoto.com/file_thumbview_approve/8223220/2/istockphoto_8223220-elegant-manhattan-townhouses.jpg&imgrefurl=http://www.istockphoto.com/stock-photo-8223220-elegant-manhattan-townhouses.php&usg=__5yroYzKyJz1hTP1mabCS1Bxw8a0=&h=380&w=336&sz=104&hl=en&start=0&zoom=1&tbnid=wRnc1XokAh1k9M:&tbnh=162&tbnw=145&ei=HzrXTb3YG4rLgQfS8dxX&prev=/search%3Fq%3Dmanhattan%2Btownhouse%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US
fficial%26biw%3D1366%26bih%3D632%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=857&vpy=77&dur=168&hovh=239&hovw=211&tx=146&ty=145&sqi=2&page=1&ndsp=20&ved=1t:429,r:4,s:0
Now, each of the homes are connected to the other 2 next to it. Every floor as 2 doors on separate sides that let you go into other people's houses. Why? I don't know, it's a dream.
So, I'm on the floor beneath the attic, (5th floor) and I'm playing around with my necrons and orks. (I play orks
IRL but not crons) There's a catch however: The models are alive.
Think this movie:
http://www.imdb.com/title/tt0122718/ (And for anyone who haven't seen it, watch it now! It's amazing)
Basically their eyes glow and their arms move. So I'm like hey I'm bored. Let me run a skirmish between my own necrons n orks. So I pull out 1.5k necrons and 1.5k armies and have them skirmish. Yes I'm playing
40k by myself in a dream.
Now here's where things get weird. Remember that door that leads to the neighbor's house?
While my orks are fighting my crons, I look at the door and it's open. And around 100,000 points of orks come streaming through. We're talking all kinds of boyz, nobz, bosses, wagons and even stompas. There are so many orks I can't even see the ground as they march into my room. Just waves of orks. So naturally 100,000 points of orks decimate my 1.5k crons and 1.5k orks.
Keep in mind that these models are actually alive so they're moving of their own will and fighting. It's as if I was some god giant that loomed over them, completely ignored.
Apparently, one of my orks (in the midst of the fight) ran away to the neightbor's house and alerted the orks there that there was some "good fightin" going on here.
So, my guys get slaughtered and start dissapearing. I start panicking because apparently there's some
GW rule where if a certain amount of models enter a given space, dead models dissapear instead of flipping over or waiting for you to pick them back up. They fade away like ghosts.
Now I'm panicking. I'm thinking, OMFG my models NOOOO! They're alot of money, time and love.
After the great massacre I'm picking up my dudes slowly, shifting through this unknown live ork mobs who are 1" tall swarming around me (though they don't seem to notice me). At this point the doorway is empty and but the entire floor of where my little skirmish was happening has been completely covered by enemy orks.
Just as I'm salvaging what boyz and warriors I got left, 100,000 points of blood angles come streaming in from that same door. I'm talking COUNTLESS tactical marines, assault marines, predators, land raiders and thunderhawks in some giant wave that would put epic
40k art to shame. The orks react and countercharge and there is a great clash.
Now my models ALL begin to disappear very fast as we're clearly over the limit
GW set and now I'm sweating balls, realizing that I just lost like $500+ worth of models.
Eventually the fighting stops, casualties everywhere. Wrecked stompas, crashed thunderhawks, bodies everywhere. 2 Guys come through the door and are like "DUDE
WTF why is my army in your room?" with a shocked look upon their faces as they glance over the battlefield.
And I'm like "Yeah why the

IS there 200,000 points worth of models that don't even belong to me here?
So we begin to shift through the debris picking up whatever unwrecked/ruins models we can, all in great sorrow.
Then I figure, NO WAIT! My models must've teleported somewhere! They can't just disappear.
So I go to the attic and there part of my army is. But standing in front of them is a ton of
IG navy officers who's eyes are glowing yellow, staring at me. these 1" models in some kind of white space admiral uniform that look completely realistic and alive are staring at me with glowing yellow eyes.
At this point I wake up frustrated and angry. I'm like omg I can't believe I just lost my models. It takes me 5 minutes before I realize that was just a dream. Yes, that's how vivid and real it was. It was borderline lucid it was so clear.