Comment Ability to respond != Ability to feel (Score 3, Interesting) 105
Something similar happened to me a couple of times. When one falls asleep the brain to muscle control parts shut down. When it does not shut down properly people sleep walk and actually do things during REM. The order in which you this part shuts down, and the part that gets stimuli-response module shuts down seems to be a little muddled for me, it looks like. Long story short, just as I was drifting to sleep, the phone would ring or something, and I would try to reach over to pick the phone, but my arms and legs would not respond. The sheer terror I felt when I could not move my arms and legs was just incredible. But terror would immediately jolt the adrenal glands and adrenaline would flood the body, wake me up fully with racing heart and profuse sweat. Eventually I went through sleep studies and was diagnosed with very mild apnea and got a CPAP machine that kept my airways inflated with above atmospheric pressure (just 6mm of water, 1 atm= 10.24 meters of water). Then those episodes stopped.
But I will never ever forget the terror I felt when I my muscles would not respond to the commands I was giving them.