Immediately after going full-time, I had this awful streak of like 4 nightmares in a row where I was being clocked in the women's room.
It was pretty much the same dream every time... for some reason the stall walls were low or not there, and a woman came in and saw me, and told me I didn't belong there, and I had to defend myself. (And hide certain anatomical features.)
I had another dream where I was coming out of the water (and I have a bit of an issue with feeling clocky when I'm wet because it deflates my receded hair and makes it a bit more obvious,) and people were staring at me and I was afraid of passing.
Then the worst of all was a dream I had just recently (warning: rape/abuse triggers,) where I was in a movie theater of some sort. A guy started aggressively hitting on me, to the point of touching and serious harassment. I had to run to escape. And I was wearing a slinky red dress which, as I was desperately trying to crawl under a door to get out of the movie theater and away from him, exposed my genitals, and I was freaking out that I was going to get raped or murdered because they were hanging out where people could see them.
(Urgh... I have so many genital-based nightmares it's ridiculous. -___-)
So yeah... really common, and one of my most persistent nightmares recently.