What is sundowning?

Sundowning affects an estimated 20-45% of people with Alzheimer's disease. The exact cause is unknown, but it is believed to relate to disruption of the circadian rhythm, fatigue, low lighting, and overstimulation during the day. For caregivers, sundowning is especially challenging because it often coincides with dinner preparation and evening routines. Morning check-in calls — when the person is typically most alert and oriented — can provide a clearer picture of cognitive function than evening observations, which may be distorted by sundowning.