Being paralyzed while you sleep is a totally normal defense mechanism. You could hurt yourself if your arms and legs are flailing around while you're sleeping. So your mind locks you down almost completely. Some people having active dreams such as running or fighting will twitch a little. Often this doesn't disengage if you don't fully wake.
To the extent that we know the purpose of dreams it's to form subconscious responses and work through problems. Your mind is practicing. That's why if you play basketball all day you'll likely dream you're shooting baskets. This has the same effect of consciously imagining yourself shooting baskets, it will make you slightly more accurate. If you're dreaming about running away from something this usually means you're avoiding a serious problem in your waking life. Turning and fighting the demons in your dream will help you fight the real problem when you're awake. The problem you're avoiding isn't always obviously connected to it's dream manifestation. For example if you're worried about being fired from your job it can manifest as gang niggers coming to beat you up in your dream. If you don't think there is a real problem that you're worried about or avoiding, then you might want to consult a specialist.
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