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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