This is your sleep paralysis demon:
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This is the dance it does:
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This is the song that plays:
You can't move or wake up during the entire thing.
Time feels like it passes longer than it really is.
This will occur multiple times as you wake up from dreams within dreams like inception.
It may seem harmless but it's memetic properties will cause irrational dread and you will be unable to look away.
The fear effects it causes intensifies with each layer of dream and may even induce cardiac arrest, this is a cognitohazard so if you read this far it's already too late.