I usually have nightmares about industrial/technical horrors and have had them since youth. I dreamt about killer robots, sentient gas, or mysterious sounds and broadcasts that had the ability to main or kill. This year was no exception. Here's a good one I had in June:
I'm tossing and turning in bed, having trouble sleeping. I discover ants in the sheet. Like everywhere. So many fucking ants. So I get up off the bed, pull off the sheets. I discover that ants are POURING out of the rivets in and edges of the mattress, like sand. I went and told my mom, but she didn't believe me because the mattress was brand new.
Eventually, I discover larger bugs in the room. It turns out, the ants are turning into these larger insects. Mostly ladybugs and stuff. Then they start turning into small items that start appearing around my bedroom. I found a blue book that looked like a passport, picked it up off the nightstand, and bugs POURED out of it. At this point, I realise the ants are actually some form of self-replicating machine that has started fabricating objects at nanoscale and leaving them around my bedroom. Worse, they've started crawling around the house, and rapidly built larger and larger objects. When I stepped out onto the front porch, there was an orange "bucket" on wheels with a steel arm, picking objects up around it as it moved and dropping it in the middle. When it dropped an item into the middle, it used it as material to refabricate other objects at nanoscale, just like your body turns food into hair, skin, nails, etc.
Not long after, the bucket machine has built itself into a fucking frontend loader. I'm standing in the living room watching it put itself together, and then finally, it crashes through the bay window, attempting to destroy the house. I try to push it back out of the house, for some reason, thinking I could do battle with a 5-ton machine.
By the end of the dream, these ants have fabricated a FUCKING CRANE in the front yard, about the height of a typical office building, way past the height of the house. There's machinery on top that it is using to strike houses in the neighbourhood, destroying them. To stop this madness, I grab a can of gas and some matches and leap up on the ladder that was on the back of the crane. All the while, ants, ladybugs, and small machinery is falling from the crane around me trying to build it. I reach the top of the crane and inside the cabin was some sort of indescribably horrible humanoid at the controls. I mean, it was not human by any description I could give. I squirt the gas at it, light a match, and throw it in the cabin. Finally, I jump off the crane as it begins to blow up and collapse around me.
I'm getting itchy just thinking of it. 
