Had this one in high school.

Nightmare begins in first-person perspective.

I'm in a church that's mostly unlit except for the light from the sanctuary and am standing near the front pew. I touched the wooden pew (this was the first dream I had where I could register senses other than visual images and sound). I notice people moving around the church setting up white flowers, streaming white fabric. I stop a little girl and ask her whose wedding it was. She gives me a puzzled look and says, "It's yours." I give her my own puzzled look, and ask her who I was marrying. "Jessica," she replied. At this point, I'm confused even though because even though she was often friendly to me, I knew she was super popular (eventually became a homecoming queen) and wouldn't consider me part of her dating pool. I start pacing around the church for a little bit trying to make sense of the situation, and was kind of excited to be perfectly honest (hormonal teenager + wedding night prospects ;) ). I look up, and there she was, dressed in the gown with veil and gloves and all. I go up the sanctuary steps to meet her, and she greets me with a smile. She doesn't say anything though. She just turns her back to me and lifts up her hair. Had a pearl necklace in my hand somehow (dream logic), and clasped it around her neck.

Perspective shift from first person to third person Then I wake up in the back of a moving car, and thought about the crazy dream I just had. I look outside the car window to see us driving down the street in a familiar suburban neighborhood on an overcast day. Two white guys in sunglasses, whom I do not recognize, were in the front of the car. As we were driving, I notice one of those 4 lane children's slides on the roof of one of the houses and children headed for a significant fall off the roof. From my third person perspective, I did not see the impact, but I did ask the driver to stop the car. I got out but the slide and the children were gone. Feeling confused, I decided to stop by a friend's house who was nearby. However, instead of going to the front door like a usually do, I enter through the attic window via a ladder that was just leaning against the house. My friend says hi and we end up hanging around in the attic for a bit. Then, out of nowhere, the very same Jessica from before shows up wearing a cream colored pantsuit. Surprised me as we wouldn't be seen together outside of school let alone at the house of a friend that we did not have in common. I ask her what's up. Her face was expressionless and remained so even as she was pulling out a gun, and proceeded to shoot my friend, me, and my friend's family. The dream decided to insert an trope where each time the bullet connected with a victim, the dream would cut to a black room illumined by a singular overhead light and a personal affect of theirs would just drop to the floor. For instance, when she shot my friend, I saw his wristwatch fall to the floor. Same thing happened to my friend's mother, then father, then older brother, older sister, and so on. She missed all of the shots she took at me though. I remember four attempts total. I get to the first floor, and find the dead body of a man leaning an open door post leading to the basement. I didn't recognize him, and touched him a little, and his body fell to a landing where the stairs turned. Jessica then descended the stairs to meet this body. She knelt down and leaned into the body, and she extended her right hand to gently rub his head; her expressionlessness broke, giving way to sympathy. I take one step toward her, and she turns the gun to me. I decided to get the hell out of there.

She keeps gazing at him mournfully and eventually the scene cuts to two skeletons that held their positions. This should have been the end of it. However, I started feeling disembodied fear as Jessica started "regenerating" from the eyes outward. It was one of the most horrifying things I had ever seen or imagined to see skin and muscle having amoeba like qualities just stretching and pulling and reaching. Just as she was starting to move and get up, the roof collapses on her; cut to the lit black room and her pearl necklace falling to the floor.