I've had nightmares involving my body. The latest one had my body hair below the waist suddenly grow back, thick and tangled, and I tried to just rip it off my skin in panic. Then I noticed that the hair, all of it, was covered in some kind of substance, something that was kind of solid, but it also left these yellowish-brown stains on everything it touched. It took me a very small moment to realize it was ->-bleeped-<-. Crap. Manure. Organic waste.
A few days later, I started shaving my legs twice a day and haven't looked back since.
Interesting to note: In the dream, I was pretty much naked, and I could clearly see as I looked down that I had female genitalia. This is one of the very few times I have ever paid any attention to what is between my legs in the dream world, and in every single case, I've never had the genitals I was born with down there. And the other dreams predate my discovery of being transgender.
I've also had a similar body related nightmare, though that one was when I was ten, and it involved my legs detaching from my knees in a very messy way. Usually, I don't even get nightmares.
I mostly dream about completely illogical things that seem completely sensible when I'm still asleep. For example, one time I dreamt I had an in-built sauna heater inside me. I just showed some rocks into a hatch in my belly, and the temperature around me went up to 80 degrees Celsius. Also, I had these massive bat wings instead of arms, and I watched these shadow creatures, like shadows of animals like monkeys, snakes and parrots that were not actually there, stalk a bunch of soldiers, and the soldiers' cook made some kind of food that calmed the soldiers down, as they were getting paranoid over the shadow creatures constantly watching them. And then there was this one time me, my father, and this gorilla broke into an office building to steal computer screens. And the time I set up two dates at the exact same time, and then suddenly moved on to fighting in a war my grand-grandfather fought in, after which I found myself running in the middle of an exploding swamp, towards an alien spaceship, away from a certain childhood nightmare of a massive eye in the forest. Inside the ship, I was greeted by a Carnotaurus who told me that I should never eat Norwegian cheese or do spy's work, and then offered me a bowl full of chocolate raisins that were shaped like snakes.
So, yeah. My dreams are usually fun nonsense, and I've tried to learn lucid dreaming for a while now to get more out of it. But since my dreams are usually like that, a nightmare always catches me off guard.