Sleep Paralysis is a condition that affects many people in the world. It is directly related to the REM sleep stage and dreaming. Sleep paralysis corresponds with REM atonia, which is the state of paralysis that occurs during REM sleep. A person experiences sleep paralysis when the brain awakes from the REM sleep cycle, but the paralysis state remains. The person is conscious, but unable to move. They continue to dream and in many cases can visually experience their dreams in their room. A person experiencing sleep paralysis is not fully conscious, but well aware of what is happening. The experience has been described as distorted tunnel vision. The paralysis state may be accompanied by extreme hallucinations and a sense of danger. Many historical claims of alien abduction have been explained by extreme cases of sleep paralysis.
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| The Nightmare, by Henry Fuseli (1781) is thought to be one of the classic depictions of sleep paralysis perceived as a demonic visitation. |
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