Sundowning Explained — Why Dementia Symptoms Worsen in the Evening

One of the most distressing and least understood aspects of dementia for families and carers is sundowning — the noticeable worsening of confusion, agitation, and behavioural symptoms that occurs in the late afternoon and evening. A person who has been calm and settled all day can become anxious, restless, or even aggressive as the light begins to fade. Understanding what sundowning is — and why it happens — makes an enormous difference to managing it with patience and effectiveness rather than confusion and distress.

What Is Sundowning?

Sundowning refers to a pattern of increased confusion, agitation, anxiety, restlessness, and sometimes aggression that occurs in people with dementia during the late afternoon and evening hours — typically beginning anywhere from 4pm to sunset and sometimes continuing into the night.

It is extremely common — affecting a significant proportion of people living with dementia, particularly in the moderate stages of the condition — and it can be one of the most challenging symptoms for families and carers to manage.

Common signs of sundowning include:

• Increased confusion or disorientation
• Restlessness or pacing
• Agitation or irritability
• Anxiety or fear
• Wandering
• Resistance to care or instructions
• Hallucinations or increased suspicion
• Difficulty settling for sleep

Why Sundowning Happens

The exact cause of sundowning isn’t fully understood, but researchers and clinicians believe several factors contribute:

Disruption to the circadian rhythm Dementia affects the brain’s internal body clock, which normally regulates sleep wake cycles and energy levels throughout the day. This disruption can make the natural transition from day to evening feel disorienting rather than routine.

Fatigue By late afternoon a person with dementia has often been managing significant cognitive effort all day — processing their environment, navigating conversations, managing tasks — and genuine mental fatigue can make confusion and agitation worse.

Changing light and shadows As natural light fades, increasing shadows and reduced visibility can create confusion and even visual misperceptions — a coat on a hook may be misread as a person, for example — contributing to anxiety and fear.

Reduced stimulation and increased boredom For people in care settings, activities and structured engagement often wind down in the late afternoon, leaving more unstructured time that can increase restlessness.

Hunger or other unmet needs Hunger, thirst, pain, or the need to use the bathroom can contribute to evening agitation, particularly if the person can no longer easily communicate these needs directly.

Medication timing Some medications wear off through the day, and their reduced effect in the evening may contribute to symptom changes.

Why Understanding Sundowning Changes Everything

As I explored in how to connect with residents who have dementia — challenging behaviour in dementia is almost always communication rather than defiance. Sundowning is a perfect example of this principle.

A person experiencing sundowning is not being difficult on purpose. They are experiencing a genuine neurological and physiological response that they have very little control over. Understanding this distinction changes how families and carers respond — from frustration and confrontation toward patience and practical management.

Practical Strategies for Managing Sundowning

1. Maintain a consistent daily routine

A predictable daily structure — consistent wake times, meals, activities, and bedtime — helps support the body’s disrupted circadian rhythm and can reduce the severity of sundowning over time.

2. Maximise light exposure during the day

Natural light exposure during the day — outdoor time, sitting near windows — helps regulate circadian rhythm and has been shown to reduce sundowning symptoms in some people.

3. Reduce shadows and increase lighting in the evening

As natural light fades, turning on indoor lights before it gets dark — rather than waiting until it’s already dim — reduces confusing shadows and visual misperceptions that can trigger anxiety.

4. Limit afternoon napping

While rest is important, long or late afternoon naps can further disrupt the sleep wake cycle and potentially worsen evening symptoms. Encourage activity and engagement during the afternoon rather than extended napping where possible.

5. Reduce stimulation in the evening

Loud television, busy environments, or excessive noise in the evening can increase agitation. A calmer, quieter environment as evening approaches supports a smoother transition.

6. Plan a calming evening routine

A consistent, soothing evening routine — perhaps quiet music, a familiar activity, gentle conversation — signals safety and predictability during a vulnerable time of day.

7. Address physical needs proactively

Ensure the person has eaten, is comfortable, and doesn’t need the bathroom before symptoms typically begin. Addressing these needs preemptively can prevent some sundowning episodes.

8. Limit caffeine and stimulants

Reducing caffeine intake, particularly in the afternoon, can support better sleep wake regulation and potentially reduce evening agitation.

9. Stay calm and reassuring yourself

Your own emotional state significantly affects the person you’re caring for. Approaching evening symptoms with calm reassurance — rather than visible frustration or anxiety — helps de-escalate rather than intensify the situation.

10. Use gentle redirection rather than confrontation

If agitation occurs, gently redirecting attention to a calming activity or topic is generally more effective than arguing, correcting, or insisting they calm down.

When to Involve Medical Support

While many sundowning strategies are behavioural and environmental, it’s worth discussing significant or severe sundowning symptoms with the person’s GP or specialist, as:

• Pain that isn’t being adequately managed can contribute to evening agitation and is worth ruling out
• Medication timing or type may need review in some cases
• Underlying conditions such as untreated urinary tract infections — which commonly cause sudden confusion in older adults — should be considered, particularly if symptoms appeared suddenly
• In some cases, additional medical support may be appropriate for severe symptoms that aren’t responding to environmental and behavioural strategies

A Note for Families

If you’re caring for someone experiencing sundowning at home, please know that this is one of the most exhausting aspects of dementia caregiving — and your exhaustion and frustration in the face of it are completely understandable, not a failure of patience or love.

As I wrote in how to prevent burnout as an aged care worker — caring for someone through behaviours like this without adequate support and rest is simply not sustainable long term. Reaching out for respite support, whether through family, friends, or formal services like the Carer Gateway on 1800 422 737, is not giving up — it’s what allows you to keep showing up well over the long term.

The Bottom Line

Sundowning is a genuine, common, and challenging aspect of dementia that affects many families and carers — but understanding what’s happening neurologically transforms how it can be managed.

Consistent routine, good light management, calm environments, and proactive attention to physical needs can all help reduce the severity and frequency of sundowning episodes.

And when it does happen — patience, calm reassurance, and gentle redirection will almost always serve better than confrontation.

You are not doing anything wrong. This is the condition, not a reflection of your care.

Have you experienced sundowning with a loved one or in your work? Share what’s helped in The Good Years Club community — your experience could genuinely help another family 💙

👉 Join The Good Years Club Community — https://www.facebook.com/share/g/1Fw4FHNpJr/