This is from about seven years ago. The dream is pretty long but the gist is that I could breathe under water and me and a group of people were having fun on a pier in the middle of the ocean.
I jumped in after a couple of girls that had gone in and found myself about twenty feet below the surface. The ocean looked bottomless and black, like and endless abyss. There was a dead guy floating nearby with his pants around his ankles. The girls were no where to be found.
Needless to say, I decided I'd rather not hang around so I started trying to swim to the surface. For some reason, I couldn't make any progress upwards but instead sank even deeper into the pitch black depths. To my dismay, I could no longer breathe underwater. I was drowning and there was nothing I could do about it.
Just then, I realized that I was dreaming and also realized that I'd somehow ended up face down in my pillow, making it impossible to breathe in either reality. My body was still sleep paralyzed so I couldn't just get up but I managed to turn my head just slightly to open my airway before losing consciousness again.