Doctor here
Im not sure what you mean by inside the body, but sleep paralysis is just the way the brain stops us from acting out our dreams
When we enter REM sleep, the brain signals muscles in the body to relax and stay relaxed, to keep us from acting out our dreams. When we leave REM, the brain stops sending the signals to our muscles to stay relaxed.
People who wake up in a state of sleep paralysis just have some lag between when the brain leaves REM sleep, and when it tells the arms and legs they can move again
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