I've had a few variations over the years. Started the first year of uni and was absolutely terrifying. 'Awake' but paralysed, trying with every ounce of energy to move or to scream. No precence or anything. I eventually learnt that I had to relax and go back to sleep to come out of it.
I've also had the absolutely realistic feel of a cat walking over me in bed.
I had the feel of my step child walking into my room and standing by my bed, combined with paralysis - that was many years ago, and haven't had it so far with my own young children yet.
I also get very very vivid dreams occasionally. I've woken up, got up and looked out of the window, had the feeling that it was a dream but decided it couldn't possibly be because there's no way my brain could imagine the exact details of what I was seeing - only thing is, my bedroom window looked out onto a carpark and I was seeing a beautiful meadow 😂. But it was different to normal dreams as I felt that I could think clearly and had the ability to question if I was dreaming.
Don't get them anywhere near as regularly now, but my last one just last week was on a loop of me 'waking up'. So I'd be absolutely convinced that I was awake, boring routine of getting up, check baby, head to bathroom, but then I'd wake up for real and think, oh I just had that vivid dream where I think I woke up and got up, but then I'd wake up again, and think, that's weird, I keep dreaming I've already woken up and got up, but now I've woken up for real. It was horrible and went on for about 5 wake ups before it was the real one!
I also get the very real feel of teeth falling out - which is quite a well documented one linked to stress. But I always find it crazy how I can completely remember that feel and taste of a tooth wobbling and falling out as a child, and recreate it as a dream. I've also done the: oh, last week I had the dream where a tooth fell out and now it's happening for real... Nope, this one's a dream too!
AND... at risk of having the longest most boring post ever, I've also had two times in my life where I've lost my memory on waking (real waking, not a dream!) Once was just a normal day, woke and knew my alarm had gone off for work but didn't know what I did as a job or where in the country I lived. Had to lie there for what felt like the longest time for it to come back to me. The second time was just after I'd had my first child (maybe a few days or a week before so I'm sure sleep deprivation played a parr). I woke with no idea who or where I was, just this overwhelming feeling that something good had happened. It wasn't so much scary at the time, but terrifying thinking of that feeling being longer term with something like dementia.