Nightmare - Wikipedia
https://en.wikipedia.org/wiki/Nightmare
A nightmare, also known as a bad dream, is an unpleasant dream that can cause a strong emotional response from the mind, typically fear but also despair, anxiety or great sadness. However, psychological nomenclature differentiates between nightmares and bad dreams; specifically, people remain asleep during bad dreams, whereas nightmares can awaken individuals. The dream may contai…
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