[ suhn-dou-ning ]

  1. Psychiatry. a state of confusion, disorientation, or anxiety seen late in the day or at night, especially in dementia patients, likely as a result of strange surroundings, drug effects, decreased sensory input, or reduction of oxygen supply to the brain: Two randomized controlled trials of the new drug have found a significant improvement in sundowning and other agitated behavior.

Origin of sundowning

First recorded in 1870–75, for an earlier sense; sundown + -ing1

Words Nearby sundowning Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024