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  1. Nightmare - Wikipedia

    A nightmare, also known as a bad dream, [1] is an unpleasant dream that can cause a strong emotional response from the mind, typically fear but also despair, anxiety, disgust or sadness. …

  2. Why We Have Nightmares (And How to Prevent Them)

    May 2, 2024 · Knowing the differences between bad dreams, nightmares, and nightmare disorder is a first step to addressing the causes of nightmares, starting appropriate treatment, and …

  3. Nightmare disorder - Symptoms and causes - Mayo Clinic

    Jun 5, 2021 · A nightmare is a disturbing dream associated with negative feelings, such as anxiety or fear that awakens you. Nightmares are common in children but can happen at any age.

  4. NIGHTMARE Definition & Meaning - Merriam-Webster

    Because it was believed to come in the night, it later became known in Middle English as a nightmare. It was not until the 16th century that the word nightmare came to mean "a …

  5. 7 Reasons You’re Having Nightmares

    May 22, 2024 · A sleep psychologist explains why nightmares happen and shares tips that will help you stop living out Metallica’s iconic song, “Enter, Sandman,” so you can start getting a …

  6. Adult Nightmares: Causes and Treatments - WebMD

    May 1, 2025 · When you wake up terrified from a disturbing nightmare, you might think you're the only adult who has them. After all, aren't adults supposed to outgrow nightmares?

  7. Nightmare | Definition, Causes, Prevention, & Facts | Britannica

    nightmare, disturbing dream that provokes a strong negative emotional reaction. Nightmares differ from other dreams in that they typically cause the sleeper to awaken because of emotional …