If someone with dementia is calm during the day but becomes confused, restless or agitated as the afternoon fades, you may be seeing sundowning. It is one of the most exhausting parts of dementia care because it hits at the end of the day, when the caregiver is tired too. Understanding why it happens is the first step to managing it.
What Is Sundowning
Sundowning, also called sundown syndrome, is a group of symptoms, including confusion, agitation and behavior changes, that tend to appear or worsen in the late afternoon and evening. It is not a separate disease. It is a pattern seen in people with Alzheimer’s and other types of dementia.
Symptoms often begin as daylight fades, sometimes in the late afternoon, and can continue into the night. They usually ease by morning. Roughly one in five people with dementia experience it, and it is most common in the middle to later stages. For the difference between Alzheimer’s and other dementias, see our guide on Alzheimer’s versus dementia.
Common Signs
- Increased confusion or disorientation as evening approaches
- Restlessness or pacing
- Anxiety, fear or irritability
- Mood swings, sometimes escalating to verbal or physical aggression
- Trouble sleeping and nighttime wandering
- Delusions or hallucinations in some people
The pattern can be inconsistent. A person might be tearful one evening and irritable the next, which makes it hard to spot at first.
What Triggers Sundowning
The exact cause is not fully understood, but several factors are believed to contribute. Knowing the triggers is what lets caregivers get ahead of an episode.
| Trigger | Why It Matters |
| Disrupted body clock | Dementia can disturb the internal sleep-wake rhythm, causing wakefulness and restlessness in the evening |
| Fatigue | A long day leaves less energy to cope with confusion, so symptoms surface late |
| Fading light and shadows | Lower light makes it harder to see clearly, which increases confusion and misperception |
| Overstimulation | Noise, activity and too many people late in the day can overwhelm someone with dementia |
| Unmet needs | Hunger, thirst, pain or needing the bathroom can drive agitation the person cannot express |
| Caregiver stress | Caregivers are tired by evening too, and that tension can unintentionally affect the person |
Strategies That Help
You may not stop sundowning entirely, but a calmer evening is very achievable. These approaches are used in both homes and care settings.
Build a predictable routine
A consistent daily schedule reduces confusion and anxiety. Keep wake time, meals and bedtime steady. Plan the more demanding or stimulating activities for the morning, when function is usually best, and keep evenings calm.
Manage light and noise
Increase lighting in the late afternoon before shadows form, which can reduce misperception. As evening comes, lower noise, turn off loud or distressing television, and limit the number of visitors so the environment feels calm.
Watch food and drink
Limit caffeine and sugar later in the day, since stimulants can worsen agitation and sleep problems. Offer a light snack if hunger might be a trigger.
Respond calmly in the moment
- Stay calm and reassuring, and do not argue or correct
- Ask simply what the person needs, since the behavior is often an unmet need
- Offer a familiar comfort, such as favorite music or looking at old photos
- Reduce whatever seems to be overwhelming them
- Keep them safe if they wander, rather than forcing them to sit
When to Seek Medical Advice
Talk to a healthcare provider if sundowning appears suddenly, changes sharply, or comes with signs of pain, infection or a medication side effect. A sudden change can signal a treatable problem such as an infection causing delirium, not just the dementia itself. This article is general guidance and does not replace medical advice.
Support for Caregivers
Sundowning is draining, and asking for help is a strength, not a failure. Family caregivers can use respite, adult day programs and home care for a break, and some can even be paid for the care they provide. Care staff handle sundowning more confidently when they are trained in dementia-specific communication and behavior response.
Frequently Asked Questions
What time does sundowning usually start?
Often in the late afternoon or early evening as daylight fades, and it can continue into the night before easing by morning.
What stage of dementia is sundowning?
It can occur at any stage but is most common in the middle and later stages of dementia.
What triggers sundowning?
Common triggers include fatigue, a disrupted body clock, fading light and shadows, overstimulation, and unmet needs like hunger or pain.
How do you calm someone who is sundowning?
Stay calm, do not argue, ask what they need, offer a familiar comfort like music, and reduce noise and bright or confusing surroundings.
Can sundowning be cured?
There is no cure, but a consistent routine, managed lighting and a calm evening environment can reduce how often and how severely it happens.
Dementia Care Training for Massachusetts Facilities
One Health and Beyond trains care staff to handle sundowning and other dementia behaviors with confidence, for nursing homes, assisted living and home care teams across Massachusetts. Contact us to plan a seminar.
