I helped start a subreddit that was like “thatweirdbathroomdream” or something, I don’t remember it was easily a decade ago explicitly for people to talk about their weird bathroom dreams! Apparently it’s a typically American dream (so is losing your teeth but cutting your hair/hair falling out is more universal) and typically includes unusual open spaces, lack of privacy, unusual lighting, they typically also are clean like this or filthy, or at least the toilet you interact with could be filthy. I find collective cultural dreams to be SO fascinating

Unfortunately it was too niche and I’m assuming has since died