Thread: problem with SP

Ok, I hope I don't get in trouble or anything but I posted this somewhere else and I wasn't really getting the answers I needed. I was wanting more of a medical/scientific answer. So here is my question again:

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Does anyone know what the body Physically does to stay paralyzed during sleep?

I've had problems on several occasions where I finally get lucid and then while trying to do things in a dream I end up doing them with my physical body.
-tried rubbing my hands to stabalize a dream and actually woke myself up.
-tried to run really fast and kicked my legs in bed.

*These are the instances I remember clearly becuase I was lucid. Please let me stress that this happens all the time lucid or not. I have woken up with bruises on my body, comforter on the other side of the room, I even bashed my head into the wall one day.

I'd imagine the brain must produce some sort of chemical during sleep to keep your body still. Is there any kind of food or supplemenet I can try?
Please help!