When I was younger, I used to have the same recurring nightmare.
As most children do, from a very young age I was unfortunately bestowed with a deathly fear of the dark, and for me, this phobia seemed to manifest itself in the most haunting manner.
Night after night, whilst still asleep and within my dream, I'd wake up.
I'd feel this suffocating, fluid blackness heavy against my limbs and my chest, crushing the air out of my lungs and almost stinging this sense of fear into my very skin. The dark would press heavy against my temples, and my eyes would stare wildly, seeing nothing. And every night I'd fight so desperately to escape it.
Now as an adult, I know this was sleep paralysis, but as a little kid, you can imagine this was scary as BALLS.