sundowner syndrome

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sundowner syndrome (uncountable)

  1. (medicine, psychology, psychiatry) A state of agitation, confusion, or delirium, especially in elderly patients suffering from Alzheimer's disease or other forms of dementia, which begins daily at nightfall and which is alleviated by daylight.
    • 2003, Susan B. Connor, "Ch. 10: Nursing Care in Flight," in Aeromedical Evacuation, Springer (New York), →ISBN, p. 139,
      Patients who become easily confused, such as elderly patients with "sundowner syndrome" or dementia, and patients recovering from drug-related hallucinations may manifest symptoms during flight regardless of the time of day.