Sundowning is a pattern of increased confusion, agitation, anxiety, and restlessness that affects people with Alzheimer’s and other forms of dementia in the late afternoon and early evening. According to the Alzheimer’s Association, it is not a disease itself but a set of symptoms that can include difficulty sleeping, hallucinations, pacing, and disorientation. A 2025 review in the Journal of Clinical Medicine found that sundowning affects between 1.6% and 66% of people with dementia, with higher rates consistently appearing in people with more advanced disease. It cannot be prevented entirely, but it can be managed significantly with the right environment, routine, and staffing approach.
If you have been watching a parent or spouse become noticeably more confused or agitated as the sun goes down, you are not imagining a pattern. What you are observing has a name.
Sundowning is one of the most common and most distressing behavioral symptoms of dementia. It is also one of the most misunderstood. Many families spend months managing escalating evenings at home before they understand what is driving it or what actually helps.
This guide explains what sundowning is, why it happens, what triggers it, and what the evidence shows actually reduces it. It also explains what good memory care does differently in the hours when sundowning is most likely to occur.
What Sundowning Actually Is
Sundowning is not a separate disease or a stage of dementia. It is a pattern of behavioral symptoms that emerge in the late afternoon or early evening in some people living with Alzheimer’s or dementia. The Alzheimer’s Association defines it as increased confusion that people with Alzheimer’s and dementia may experience from dusk through the night.
Symptoms can include any combination of the following:
- Increased confusion about time, place, or familiar people
- Agitation or restlessness that appears suddenly in the late afternoon
- Anxiety, fear, or suspiciousness that was not present earlier in the day
- Pacing or wandering, particularly after dark
- Hallucinations or misperceptions of what they see in low light
- Difficulty sleeping or reversal of the normal sleep-wake cycle
- Emotional outbursts directed at caregivers or family members
A 2025 review, Sundowning Syndrome in Dementia: Mechanisms, Diagnosis, and Treatment, found that sundowning affects between 1.6% and 66% of people with dementia, with the wide range reflecting differences in how it’s defined and measured across studies. For families living with it, a more practical figure comes from WebMD: up to two in three people with Alzheimer’s experience symptoms of sundowning at some point. Most families navigating dementia will encounter it.
Why Sundowning Happens
The exact cause is not fully understood, but several factors are consistently identified in the research. The Alzheimer’s Association notes that sundowning may occur due to disease progression and changes in the brain, including disruption of the biological clock that regulates when a person feels awake or asleep.
Changes in the brain’s internal clock
Dementia causes damage to the brain regions that regulate circadian rhythms. As the disease progresses, the signal that tells the brain it is time to be calm and prepare for sleep becomes less reliable. The result is a brain that is confused about what time of day it is, especially when natural light begins to fade.
Physical and cognitive exhaustion
By late afternoon, many people with dementia have depleted their reserves from navigating a day that is cognitively demanding. When communication is impaired, agitation becomes their way of expressing discomfort, hunger, fatigue, or the need for the bathroom. The exhaustion is real; the behavior is the communication.
Environmental triggers
Low lighting, background noise, unfamiliar routines, and overstimulation all contribute to evening confusion. As natural light decreases, shadows form in familiar spaces. A person with dementia may see something in those shadows that triggers fear or disorientation. The same lamp in the same corner can look completely different at dusk than it did at noon.
Caregiver fatigue in the evening
There is also a social component. People with dementia are sensitive to the emotional state of those around them. When a family caregiver is tired, stressed, or less patient by evening, the person with dementia often picks up on that tension and mirrors it. This is not manipulation. It is a neurological sensitivity that intensifies as dementia progresses
What Sundowning Looks Like at Home vs. in Memory Care
| What It Often Looks Like at Home | What a Well-Staffed Memory Care Setting Does Differently |
| Evening confusion escalates without a clear trigger | Staff recognize the approaching sundowning window and shift to calming routines before symptoms peak |
| Caregiver is exhausted and less able to de-escalate | Shift changeovers are managed to maintain familiar faces during the vulnerable window |
| Lights dim at the same time the person becomes agitated | Lighting is actively managed in the late afternoon to reduce shadows and maintain brightness |
| Television or household noise adds stimulation | Environmental stimulation is reduced; familiar, calming music replaces background noise |
| No structured activity to anchor the transition to evening | Structured, low-demand activities bridge the afternoon-to-evening transition |
| The person wanders to unfamiliar parts of the home | The secured environment limits wandering risk while preserving freedom of movement within it |
What the Evidence Shows Actually Helps
Non-pharmacological approaches are the first line of management for sundowning. The National Institute on Aging recommends several evidence-informed strategies that families can implement at home and that memory care communities use systematically.
Morning light exposure and regular outdoor time
Natural light during the morning and early afternoon helps reinforce the brain’s circadian rhythm. Spending time outside when sunlight is strong helps the biological clock stay oriented. When outdoor access is available in a secure environment, this becomes a consistent daily practice rather than something that depends on weather or caregiver capacity.
Maintaining a consistent, predictable routine
A dementia-affected brain relies heavily on external cues to figure out what time of day it is and what’s supposed to happen next. A consistent routine supplies those cues automatically: the same meals, activities, and transitions at roughly the same times, so the brain has fewer confusing signals to interpret as evening approaches, on top of an already-unreliable internal clock.
Reducing stimulation in the late afternoon and evening
Lowering background noise, reducing television, dimming harsh overhead lights while maintaining overall brightness, and avoiding demanding conversations or activities in the evening hours all reduce the sensory load that contributes to sundowning episodes.
Meeting physical needs proactively
Pain, hunger, thirst, and needing to use the restroom are all common triggers for agitation in people with dementia. In the evening hours, when communication ability is most compromised, checking for these physical needs before agitation starts is more effective than responding to it after it does.
Familiar, calming sensory engagement
Soft music from the person’s past, a gentle hand massage, a familiar object with meaningful texture, or a short walk in a secure space can interrupt the buildup of agitation before it escalates. These are not distractions; they are legitimate neurological interventions that engage the parts of the brain that remain accessible even in later stages of dementia.
A Sundowning Trigger Log for Family Caregivers
Tracking what happens before sundowning episodes is the fastest way to identify the triggers specific to your loved one. Bring this log to a physician or memory care consultation.
- Time of day when symptoms typically begin (note the exact time over several days)
- What activity or environment the person was in immediately before symptoms appeared
- Light and noise level in the space when symptoms started
- Physical state: had they eaten recently? Was there any sign of discomfort?
- Who was present, and what was the emotional tone of the interaction
- What seemed to help, even briefly
- What seemed to make it worse
- Duration of the episode and how it was resolved
Sundowning and the Decision to Consider Memory Care
Sundowning is one of the most common reasons families reach the decision point about memory care. It is not the cognitive decline itself that typically pushes families past their capacity. It’s the nights.
Disrupted sleep, escalating evening episodes, wandering risk after dark, and the physical and emotional toll on family caregivers accumulate over months. A 2024 report from the Alzheimer’s Association found that 70% of dementia caregivers report that coordination of care is stressful, and more than half report that navigating healthcare is difficult. Sundowning is often the behavioral symptom that sits at the center of both.
If sundowning is worsening and the evening hours are no longer manageable at home, that’s often one of the clearest signs that memory care has moved from an option to a practical necessity.
Inside a memory care community, that late-afternoon window looks nothing like an unmanaged evening at home: lighting, staffing, and activity all shift ahead of the symptoms rather than reacting to them. How the late afternoon and evening are actually structured at Farmington Square Medford shows what that shift looks like in practice.
Farmington Square Medford, a Memory Care community in Medford, Oregon, builds its evening routines around exactly this window. Contact us to see how that shows up firsthand during a tour timed for the late afternoon.
Frequently Asked Questions About Sundowning
What stage of dementia does sundowning typically occur?
Sundowning can occur at any stage of dementia but is most common in the middle and later stages, when the biological clock disruption and cognitive load are most significant. Some people with early-stage Alzheimer’s experience mild sundowning, but the severity typically increases as the disease progresses.
Can sundowning be treated with medication?
Medication is generally not the first approach. Non-pharmacological strategies such as routine, light management, and environmental modification are recommended first. When behavioral interventions are insufficient, a physician may consider low-dose medications for agitation or sleep disruption. Any medication approach should be discussed with a physician familiar with the specific type of dementia and the person’s overall health profile.
Does sundowning go away as dementia progresses further?
Sundowning can change in character as dementia advances. In some people, the most intense sundowning occurs in the middle stages and may ease somewhat in later stages as activity level and overall arousal decrease. However, this varies significantly by individual and should not be assumed as an outcome.
Will moving to memory care make sundowning worse?
A transition to a new environment can temporarily increase disorientation, including during sundowning hours. Good memory care communities plan for this by maintaining especially predictable routines and additional support during the adjustment period, typically the first two to four weeks. Over time, the consistent environment, familiar staff, and structured evening routines of a quality memory care setting generally reduce sundowning compared to an increasingly unmanageable home situation.
Author Byline: The Care Team at Farmington Square Medford
Reviewed By: Jenni Bost, Radiant Senior Living
