Sign or Symptom
nightmare Audio
night·mare [ nahyt-mair ]
Definitions related to nightmares:
  • A disturbing dream that occurs during rapid eye movement sleep and results in feelings of strong terror, fear, distress, or anxiety.
    NCI
    U.S. National Cancer Institute, 2021
  • A disturbing dream that results in feelings of fear, distress, or anxiety.
    NICHD Pediatric Terminology
    U.S. National Cancer Institute, 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.