When you catch yourself your brain is in a very limited, paniced, broken record which you are also aware of which adds to the fustration. It's a chemical misfire in the "wake from sleep" part of your brain. You need to focus on going back to sleep to restart the thing like cranking an old car.

But yea i've had 100s of sleep paralysis episodes including false wakes where I would be astro projecting around the house until I realize something is amiss and I'm not really up. Then there's the time distortion because lighting can look different when projecting. So when I do wake up it's a panic to see what the real world time is.