CareGrade™ OriginalWhat Sundowning Is
Sundowning is the name for the pattern where a person with dementia becomes more confused, restless, agitated, or distressed in the late afternoon and evening. It is sometimes called late-day confusion.
It is common, it is distressing for everyone involved, and it is not a sign of failure on anyone's part.
The Alzheimer's Association notes that sundowning is often linked to fatigue, low light, and disrupted body-clock rhythms — which is exactly why it belongs in a conversation about sleep.
Why It Happens in the Evening
Several factors converge at the end of the day:
- Fatigue. After a full day, the brain has less capacity to compensate for cognitive impairment.
- Fading light. Shadows and dim rooms make it harder to interpret surroundings.
- Reduced structure. Meals, activities, and staff routines wind down, leaving less orientation.
- Hunger, thirst, or a full bladder. Basic needs that cannot be clearly expressed.
- Pain. Often untreated and often worse by evening.
- Over-stimulation earlier in the day. Too much noise or activity earlier can show up as agitation later.
- Medication timing. Some drugs peak in the evening.
The Sleep Connection
Sundowning and poor sleep reinforce each other. A person who sleeps badly at night is more fatigued and more likely to sundown. A person who sundowns is more agitated and less likely to settle at night.
The body-clock link is important: people with dementia frequently have disrupted circadian rhythms, meaning the internal signal for "day" and "night" is weaker. Light exposure and routine are the main tools for strengthening it.
What Actually Helps
In the morning:
- Bright light early — time outdoors or beside a bright window
- The most demanding activities (bathing, appointments) earlier in the day
- Regular meals and physical activity
- Limit daytime napping, especially long or late naps
In the late afternoon:
- Dim the lights gradually rather than all at once
- Reduce noise, television, and the number of people in the room
- Close curtains before dusk so shadows do not shift
- Offer a snack and something to drink
- Keep the routine predictable
In the evening:
- A calm, familiar wind-down — quiet music, a warm drink, gentle routine
- A night light so the room is never fully dark or disorienting
- Consistency: the same order of steps each night
And always:
- Check for pain, constipation, urinary infection, and dehydration — these are frequent, treatable triggers
- Review medications with a physician
When behavior changes suddenly, think "medical first." A urinary tract infection, untreated pain, or a new medication can look exactly like a worsening of dementia.
What to Avoid
- Sedatives as a first response. They increase falls, confusion, and grogginess, and are discouraged in older adults with dementia.
- Arguing with the person's reality. Redirecting and reassuring works better than correcting.
- Restraint or locked doors without clinical guidance.
- Large evening events, crowds, or loud television.
- Caffeine late in the day.
The Bottom Line
Sundowning is driven by fatigue, light, rhythm, and environment — all of which can be shaped. The best results come from a consistent daily routine, bright mornings, calm evenings, and a low threshold for checking for medical triggers.
This is educational guidance, not medical advice.
Sources
- Alzheimer's Association — Sleep Issues and Sundowning: https://www.alz.org/help-support/caregiving/stages-behaviors/sleep-issues-sundowning
- NIH National Institute on Aging — Alzheimer's and Dementia: https://www.nia.nih.gov/health/alzheimers-and-dementia
- NIH National Institute on Aging — Sleep and Older Adults: https://www.nia.nih.gov/health/sleep/sleep-and-older-adults