Responding to late-day confusion

The Rising Burden of Sundowning

Late-day confusion, commonly termed sundowning, manifests as heightened agitation, restlessness, anxiety, and disorientation in people with dementia during late afternoon and evening hours. This pattern disrupts circadian rhythms already compromised by neurodegenerative changes in Alzheimer's and related conditions.

A 2025 study from Washington University indicated that disrupted sleep-wake cycles may not merely accompany Alzheimer's but actively contribute to amyloid buildup and disease progression, positioning circadian interventions as a potential therapeutic frontier.

In Canada, the Alzheimer Society estimates 771,939 people lived with dementia in early 2025, with projections showing a 65% rise by 2030 compared to 2020 levels and annual new cases climbing to 187,000. Sundowning exacerbates this crisis: affecting up to 66% of those with Alzheimer's or other dementias, it intensifies caregiver strain through fragmented sleep, emotional distress, and increased behavioral management demands.

The real-world toll includes accelerated decisions for long-term care placement, as sundowning ranks among top triggers for institutionalization due to its exhausting, often nightly recurrence. Caregivers—predominantly unpaid family members—face elevated risks of depression and health decline from chronic exhaustion.

Non-obvious tensions emerge in management approaches. While bright light therapy and routine consistency show promise in reducing symptoms per recent reviews, pharmacological options like antipsychotics carry risks of side effects in vulnerable older adults. Memantine use appears protective in some data, yet broader reliance on drugs versus environmental adjustments remains debated amid workforce shortages in dementia care.

Seasonal factors, such as reduced daylight in fall and winter, or abrupt changes like daylight saving time shifts, can worsen episodes, adding unpredictability to an already volatile symptom.