n.
A form of agitation or anxiety exhibited at night by some elderly hospital patients and nursing home residents.
Example Citation:
"Doraiswamy also said there apparently is a body-clock related problem among the elderly in nursing and rest homes called 'sundowning,' when patients become agitated and difficult to deal with at night."
— Anne Saker, "Findings on body clocks enlightening," The News and Observer (Raleigh, NC)
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New words. 2013.