Usually means: Heightened alertness, excessive emotional response.
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We found 9 dictionaries that define the word hyperarousal:

General (6 matching dictionaries)
  1. hyperarousal: Merriam-Webster
  2. hyperarousal: Collins English Dictionary
  3. hyperarousal: Wordnik
  4. hyperarousal: Wiktionary
  5. hyperarousal: Dictionary.com
  6. Hyperarousal: Wikipedia, the Free Encyclopedia

Medicine (3 matching dictionaries)
  1. hyperarousal: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Hyperarousal: Medical dictionary

Definitions from Wiktionary (hyperarousal)

noun:  A state of heightened psychological and physiological tension resulting in reduced pain tolerance, anxiety, excessive response to sensory stimulation, insomnia, and fatigue.

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