My most realistic dream that I have ever had was actually a nightmare. In almost all my dreams I am in an "made up" house that is imaginary and does not exist in real life. Sometimes the people in my dreams don't exist, either. But in this one....well.....I had this back when I was sleeping on the couch more regularly.
I feel asleep on the couch. I woke up and I could hear a noise coming from the laundry room. At first I thought it was my cat Omni but then the shuffling and banging got louder and it sounded like it HAD to be a person. I got really scared so I tried to yell for my parents. I could not make a noise. Since I couldn't yell I thought "I am going to make my parents here me, one way or another!" so I started banging on the couch. When I banged on the couch it didn't make any noise and that's when I realized I was dreaming. So I wondered how I could wake up from it. Something that will make a really loud noise I guess. I sat on the coffee table and pushed it over, thus waking myself up.
Okay, I know it's not completely realistic but it is the only dream I ever had that was complete with my house, my sleeping place, all the furniture and locations in my house arranged accurately, even the coffee table and the paintings on the wall. The only thing that wasn't accurate was that the coffee table was clean in the dream and it wasn't in real life at the time. It had papers on it.
I've also had dreams I regretted waking up from. Like when you're holding someone who died in your arms and then you wake up and the first thing to enter your mind is "they're really....gone"