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Worsening of delirium or dementia symptoms later in the day.

Example: An 82-year-old woman with Alzheimer’s disease is calm and oriented until evening, when she becomes fearful and restless. This happens repeatedly.

APA Reference
Grinnell, R. (2016). Sundowning. Psych Central. Retrieved on May 24, 2018, from https://psychcentral.com/encyclopedia/sundowning/