I had brief episodes on holiday once - I think the combination of alcohol, sunlight and lack of sleep contributed massively to it all.
I would think that my wife was spooning me whilst asleep but then when I looked down the hands were black and spikey, and the shape would then move over on top of me. During one episode, I began screaming in my sleep and my wife had to wake me up as she described it as "screaming with your mouth closed". She had never been more frightened in her life.
I also used to have the same dream 3-4 nights a week. I would be attempting to cross a familiar road however at the end of the road was a Nazi machine gun firing down the road. Everytime I attempted to cross, it was spray a trigger worth of bullets at me. I then got a new job in 2017 and subsequently I've not had the dream since.
I can easily tell myself during a dream that I am asleep and I need to wake up.