Yes, its a form of sleep apnea. I sleep or am suppose to sleep with my cpap. I notice that I dont have the paralysis as much when I do. I can go to sleep then all of a sudden feel my self shut down. suddenly i am aware of everything going on around me, i can even see it, but im not sure if my eyes are open or not, i struggle to wake up, i shout and scream but no one else hears me. I keep telling myself if i can just wiggle my big toe i will wake up and change positions. finally, i feel blood rushing back into my limbs and i wake up. it usually happens when i sleep on my back or if my head isn't on atleast 2 pillows. when i had my sleep study done, i told the tech about sleeping and then suddenly feeling like i am paralized. he told me what it was and that it's also a form of sleep apnea. lack of oxygen to the brain.