Anyone else have nightmares when their feet are left uncovered when they sleep? Or sleep paralysis when they sleep on their back?

I've noticed this over the years, I only have nightmares when my feet are uncovered, and I only suffer from sleep paralysis when I sleep on my back (I sleep on my stomach normally).
Am I alone on this?
Anyone else have nightmares when their feet are left uncovered when they sleep? Or sleep paralysis when they sleep on their back?
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