Does anyone else experience this whilst sleeping?

I would be asleep, but kind of conscious that I'm sleeping and then I would be completely paralyzed, my heart pounds and i experience a weird current through my entire body. I try to scream out for help but it doesn't work. Some times it is accompanied by voices and faint images, sometimes with nothing at all.
Is it anxiety or sleep paralysis?
Does anyone else experience this whilst sleeping?
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