Sundowning: what it is and how to manage it

Sundowning — the pattern of increased confusion, agitation, and anxiety that occurs in the late afternoon and evening — is one of the most challenging aspects of caring for someone with dementia at home. It can transform a relatively calm day into hours of restlessness, pacing, and distress. Understanding why it happens and what can help is essential for families navigating dementia care.

What Causes Sundowning

The exact mechanisms behind sundowning are not fully understood, but researchers believe it involves disruption to the body's internal clock — the circadian rhythm — which regulates sleep-wake cycles, hormone production, and body temperature. In dementia, the brain regions that manage these rhythms deteriorate, leading to a cascade of effects that worsen as the day progresses.

Fatigue plays a significant role. By late afternoon, a person with cognitive impairment has spent the entire day processing a world that feels increasingly confusing. Mental exhaustion lowers their threshold for coping, and behaviors that were manageable in the morning become overwhelming by evening.

Environmental factors contribute as well. The shift from daylight to artificial lighting creates shadows and changes in visual perception that can trigger confusion or hallucinations. Reduced activity in the household as evening approaches can increase feelings of isolation or anxiety.

Practical Strategies for Managing Sundowning

Maximize daylight exposure. Natural light is one of the most effective regulators of circadian rhythm. Encourage time near windows or outdoors during the morning and early afternoon. Some families find that full-spectrum light therapy in the morning helps stabilize the sleep-wake cycle.

Create a structured afternoon routine. Rather than allowing the late afternoon to become an unstructured void, plan a gentle activity — a short walk, light stretching, sorting photographs, folding towels — that provides engagement without overstimulation.

Manage the lighting transition. Before sunset, turn on warm, bright lights throughout the living spaces. Eliminate shadows by using multiple light sources rather than a single overhead fixture. Close curtains before it gets dark to reduce the visual contrast between indoor and outdoor light.

Reduce stimulation in the evening. Lower the volume on televisions and radios. Avoid large family gatherings or phone calls during peak sundowning hours. Keep conversations calm, simple, and reassuring.

Watch for physical triggers. Pain, hunger, thirst, and the need to use the bathroom can all intensify sundowning behaviors but may not be communicated clearly by someone with dementia. Offer a snack and drink in the late afternoon, check whether they are comfortable, and consider whether an undiagnosed urinary tract infection might be contributing to increased confusion.

When Sundowning Requires Professional Support

If sundowning is causing significant safety concerns — attempts to leave the home, aggression, severe sleep disruption, or caregiver exhaustion — it may be time to introduce professional evening or overnight care. A trained dementia caregiver can provide the calm, consistent presence needed during these difficult hours while allowing family caregivers to rest.

Discuss persistent or worsening sundowning with the person's physician. Medication adjustments, sleep aids, or treatment of underlying conditions can sometimes reduce the severity of episodes.