Full Definition

Sundowning (also called late-day confusion or sundown syndrome) refers to a pattern of worsening confusion, agitation, restlessness, or behavioral disturbance in people with dementia that tends to emerge or intensify in the late afternoon and evening. It is not a separate diagnosis but rather a cluster of symptoms observed in a significant portion of people with Alzheimer’s disease and other dementias.

The exact cause is not fully understood, but contributing factors include disrupted circadian rhythms (the brain’s internal clock is often damaged by dementia), fatigue accumulating through the day, reduced lighting at dusk (which can increase disorientation), and the transition between day staff and evening staff in care settings (which can feel unsettling to residents).

For families and caregivers, sundowning is one of the most exhausting and stressful aspects of dementia caregiving. The person may become suspicious, agitated, tearful, or attempt to leave the home. Management strategies include maintaining a consistent daily routine, increasing light exposure during the day, limiting afternoon naps, scheduling calm activities in the late afternoon, and evaluating medications for contributing factors.

Memory care communities are specifically designed to manage sundowning safely — with secured environments, trained staff on evening shifts, and structured programming designed to reduce behavioral disturbance around the late-day transition.