Sundowning in Dementia: Symptoms, Causes, and How Caregivers Can Help

If you have ever cared for someone with Alzheimer’s disease or another form of dementia, you may have noticed a troubling pattern: as the late afternoon fades into evening, your loved one becomes noticeably more confused, agitated, or anxious. This phenomenon is known as sundowning — sometimes called sundowner dementia, sundown syndrome, or sundowners syndrome — and it is one of the most common and challenging behavioral disorders and disturbances that caregivers face.

Sundowning is not a disease in itself. It is a cluster of dementia-related symptoms that emerge or intensify during the late afternoon and evening hours, typically around sunset. According to the Alzheimer’s Association, sundowning affects up to two out of every three people with Alzheimer’s disease at some point during their illness. Understanding what sundowning is, why it happens, and how to manage it can make an enormous difference in the quality of life for both dementia patients and the family caregivers who support them.

What Is Sundowning?

Sundowning — also referred to as sundowning syndrome or late-day confusion — describes the emergence or worsening of neuropsychiatric symptoms in people with dementia during the late afternoon, evening, or nighttime hours. The term captures a wide range of behavioral and psychological changes that tend to peak as daylight fades and continue into the night.

The Mayo Clinic describes sundowning as a symptom, not a standalone condition, that occurs frequently in people with Alzheimer’s and other dementias. While the behaviors associated with sundowning can be deeply distressing for caregivers and family members, it is important to remember that the person experiencing sundowning cannot control these episodes. The changes are driven by neurological processes related to their dementia, not by choice or personality.

Sundowning vs. Delirium: Understanding the Difference

Sundowning is sometimes confused with delirium, but the two conditions are distinct. Delirium is a sudden, severe change in mental function that is typically caused by a medical issue such as an infection, medication reaction, dehydration, or surgery. Delirium develops rapidly — often within hours or days — and is usually reversible once the underlying cause is treated.

Sundowning, by contrast, is a recurring pattern tied to the time of day. It develops gradually alongside the progression of dementia and is not caused by an acute medical event. However, it is possible for a person with dementia to experience both sundowning and delirium simultaneously. Any sudden, dramatic change in a person’s behavior or cognition should prompt immediate medical evaluation to rule out delirium or other treatable conditions such as urinary tract infections, pneumonia, or medication side effects.

Sundowning Dementia Symptoms

The symptoms of sundowning can vary significantly from person to person and from one evening to the next. In some individuals, the signs are subtle — a slight increase in restlessness or a shift in mood. In others, symptoms are severe and can include aggressive or combative behavior. Recognizing these symptoms early allows caregivers to intervene with appropriate strategies before an episode escalates.

Common Sundowning Symptoms

The most frequently observed sundowning dementia symptoms include increased agitation and restlessness, heightened anxiety and fearfulness, confusion and disorientation about time or place, irritability and sudden mood changes, suspicion and paranoia, hallucinations and delusions, pacing and wandering, yelling or crying, difficulty following directions or communicating, demanding or repetitive behaviors, and resistance to caregiving activities such as bathing or changing clothes.

Sleep disruption is also a hallmark feature of sundowning. Many dementia patients who experience sundowning have significant difficulty falling asleep or staying asleep, which compounds the problem by increasing fatigue — a known trigger for more severe episodes the following evening. This cycle of sleep disturbances and worsening behavioral symptoms can be exhausting for both the patient and caregiver.

What Stage of Dementia Is Sundowning?

Sundowning can technically occur at any stage of dementia, but research consistently shows that it is most common during the middle and later stages of the disease. According to Cleveland Clinic, sundown syndrome typically begins during the middle and later stages of Alzheimer’s disease. Dementia UK reports that sundowning is thought to affect around 20 percent of people with dementia overall, and approximately 80 percent of dementia patients in residential care settings.

A study published in Frontiers in Medicine found that the severity of cognitive decline is one of the strongest predictors of sundowning, with patients who have higher Clinical Dementia Rating scores being significantly more likely to exhibit sundowning behaviors.

Importantly, research by Scarmeas and colleagues has also suggested that the presence of sundowning may itself be associated with more rapid cognitive function deterioration, meaning sundowning can be both a consequence and an accelerator of cognitive decline (Khachiyants et al., PMC).

How Long Does Sundowning Last?

Individual sundowning episodes typically begin in the late afternoon — often around 4:00 or 5:00 p.m. — and can continue through the evening hours and into the night. Most episodes improve by morning, though the person may be fatigued from a restless night. Some individuals experience sundowning daily, while others may go days or weeks between episodes.

As a recurring condition, sundowning generally persists as long as the underlying dementia continues to progress. In many cases, sundowning becomes more frequent and intense during the middle stages of dementia and may evolve or change in character as the disease advances into its later stages. There is no fixed timeline for how long sundowning will be part of a person’s dementia journey — it varies based on the individual, their type of dementia, overall health, and the effectiveness of management strategies.

How Long Does Sundowning Last Before Death?

Families often ask about the relationship between sundowning and end-of-life progression. Sundowning itself is not a direct indicator of imminent death, but it does tend to be more prevalent in moderate to severe dementia, which are the later stages of the disease. As dementia advances toward end-stage, some individuals experience increased agitation and sleep-wake cycle disruption, while others may become less responsive overall. The presence and severity of sundowning in the context of advancing dementia should be discussed with the care team to ensure appropriate comfort-focused support is in place.

Causes and Triggers of Sundowning

The exact cause of sundowning remains an active area of research, but scientists and clinicians have identified several interconnected factors that appear to contribute to the phenomenon. In most cases, sundowning is driven by a combination of neurological, environmental, physiological, and psychological triggers.

Circadian Rhythm Disruption

The most widely studied explanation for sundowning involves disruption of the body’s circadian rhythm — the internal clock that regulates the sleep-wake cycle. In people with Alzheimer’s disease, the suprachiasmatic nucleus (SCN) of the hypothalamus, which serves as the brain’s master clock, undergoes progressive degeneration. This damage impairs the body’s ability to distinguish between day and night, leading to fragmented sleep, nocturnal wakefulness, and the behavioral disturbances characteristic of sundowning.

Research published in the American Journal of Psychiatry found that sundowning in Alzheimer’s patients is directly related to a phase delay of body temperature rhythms caused by the disease, confirming the link between circadian dysfunction and sundowning behavior.

A 2025 study from Washington University School of Medicine published in Nature Neuroscience demonstrated that amyloid accumulations in the brain throw off the daily rhythms of hundreds of genes in brain cells, further clarifying the pathophysiological basis of circadian disruption in Alzheimer’s.

Melatonin Decline

Melatonin, the hormone that signals the body to prepare for sleep, decreases significantly in people with Alzheimer’s disease due to degeneration of the pineal gland. Reduced melatonin production disrupts the natural sleep-wake transition, contributing to nocturnal hyperactivity, wandering, and agitation — all key features of sundowning syndrome.

Late Afternoon Fatigue and Overstimulation

Mental and physical exhaustion accumulated over the course of the day is a major trigger for sundowning episodes. Dementia patients who have been active, attended appointments, or navigated social interactions throughout the day may have depleted their cognitive resources by late afternoon. Additionally, overstimulation from a busy environment — loud noises, multiple visitors, television — can overwhelm a person with diminished cognitive capacity, triggering agitation and confusion during the evening hours.

Environmental Factors

Changes in lighting play a significant role in sundowning. As natural light fades in the late afternoon, increasing shadows can distort the visual environment, causing confusion, fear, and even hallucinations in dementia patients who already struggle to interpret what they see. Poorly lit rooms can worsen disorientation and make familiar spaces feel unfamiliar or threatening.

Other Common Triggers

Additional factors that can agitate or worsen sundowning include unmet physical needs such as hunger, thirst, or the need to use the bathroom; underlying pain or discomfort that the person may not be able to communicate; infections such as urinary tract infections, which can dramatically worsen confusion; medication side effects, particularly from anticholinergic drugs, sedatives, or medications wearing off at the end of the day; depression, boredom, or social isolation; dehydration; and caffeine or alcohol consumption, especially in the afternoon or evening.

Can Someone Without Dementia Have Sundowners?

While sundowning is most closely associated with Alzheimer’s disease and other forms of dementia, people without a dementia diagnosis can experience similar symptoms under certain circumstances. Older adults who are hospitalized — particularly those in intensive care — sometimes develop evening confusion and agitation due to sensory deprivation, medication effects, sleep disruption, or unfamiliar surroundings. This is more accurately classified as delirium rather than true sundowning, though the symptoms can look very similar.

According to Dementia UK, people without dementia who experience sundowning-like symptoms typically have a temporary, identifiable cause such as stress, sleep disorders, medication side effects, or acute illness. If these symptoms resolve once the underlying cause is addressed, the episode is generally not considered sundowning in the clinical sense.

Managing Sundowning: Caregiver Strategies That Work

While sundowning cannot be cured, a combination of environmental modifications, behavioral strategies, and medical support can significantly reduce the frequency and severity of episodes. The Alzheimer’s Association, National Institute on Aging, and leading dementia researchers all recommend a non-pharmacological approach as the first line of intervention.

Bright Light Therapy and Natural Light Exposure

Exposure to bright light, particularly natural sunlight in the morning and early afternoon, is one of the most well-supported non-pharmacological interventions for sundowning. Light therapy helps reset disrupted circadian rhythms by reinforcing the brain’s signals for wakefulness during the day and sleepiness at night. Research suggests that consistent bright light exposure can improve sleep quality, reduce agitation, and decrease the severity of behavioral disturbances in dementia patients (ffytche et al., PMC). A dawn simulator — a device that gradually increases light intensity to mimic sunrise — can also be helpful for establishing a consistent sleep-wake cycle.

Establish a Consistent Daily Routine

People with dementia find comfort in predictability. Establishing a regular schedule for waking, meals, activities, and bedtime helps anchor the day and reduces anxiety. Structured routines signal to the person when it is daytime and when it is nighttime, reinforcing the natural rhythm that sundowning disrupts. Activities and appointments should be scheduled in the morning or early afternoon when the person is most alert, leaving the evening hours calm and low-key.

Reduce Evening Overstimulation

As the afternoon progresses, gradually reduce environmental stimulation. Turn off the television, lower background noise, dim overhead lights gently while keeping the space well lit enough to minimize confusing shadows, and avoid introducing new people or activities during the evening hours. A quiet, familiar environment during the transition from day to night can help prevent the sensory overload that triggers sundowning episodes.

Prioritize Sleep Hygiene

Good sleep hygiene is essential for managing sundowning. Encourage the person to avoid long or late naps during the day, as excessive daytime napping can disrupt nighttime sleep. Eliminate caffeine and alcohol from the late afternoon and evening. Create a calming bedtime ritual — perhaps a warm drink (non-caffeinated), gentle music, or a simple relaxation routine — to signal that it is time to wind down. Keep the bedroom comfortable, dark, and quiet.

De-Escalation Communication During an Episode

When a sundowning episode is underway, the way a caregiver responds can either calm or escalate the situation. Approach the person slowly and calmly, using a gentle tone of voice. Avoid arguing, correcting, or using logic to reason with someone who is confused or agitated — this often increases frustration. Instead, offer reassurance with simple, soothing statements. Redirect attention to a calming activity such as looking at family photos, listening to familiar music, or having a light snack. If the person wants to pace, allow it in a safe environment rather than trying to restrict movement, as physical restraint can dramatically worsen agitation.

Three Things to Never Do with a Loved One with Dementia

While caring for someone experiencing sundowning, there are three critical things to avoid. First, never argue with or try to correct the person’s perception of reality — if they believe it is morning or that a deceased relative is visiting, gently redirect rather than contradict. Second, never use physical restraint to control wandering or pacing during an episode, as this increases fear, agitation, and the risk of injury. Third, never dismiss or minimize their distress — even if the cause of their anxiety seems irrational to you, the fear and confusion they feel are very real to them. Validating their emotions while calmly redirecting their attention is far more effective than dismissing their experience.

Medical Evaluation and Treatment Options for Sundowning

If sundowning symptoms are new, have suddenly worsened, or are becoming increasingly difficult to manage, it is important to consult with the person’s healthcare provider. A medical evaluation can rule out treatable conditions that may be mimicking or worsening sundowning, such as infections, pain, sleep disorders like sleep apnea or restless leg syndrome, constipation, or medication side effects.

When to Call a Healthcare Provider

Contact a doctor promptly if sundowning episodes have started suddenly or escalated dramatically, if the person is showing signs of a possible infection (fever, changes in urination, new cough), if there have been recent changes to their medications, if the person is at risk of harming themselves or others during episodes, or if non-pharmacological strategies have been consistently applied without improvement.

How Medications Are Used Safely

Most dementia care experts agree that medications should be considered only after non-pharmacological strategies have been thoroughly tried. When medication is deemed necessary, options may include low-dose melatonin to support the sleep-wake cycle, antianxiety medications for severe anxiety or panic, and in some cases, low-dose antipsychotic medications for persistent agitation, hallucinations, or delusions. However, antipsychotics carry significant risks in elderly dementia patients, including increased risk of stroke and mortality, and should be used with extreme caution and regular medical review.

It is equally important to review all current medications for potential side effects that may be contributing to sundowning. Anticholinergic drugs, certain sleep aids, and medications that cause confusion or drowsiness as they wear off can all worsen evening behavioral disturbances. A comprehensive medication review with a pharmacist or physician is a valuable step in managing sundowning safely.

The Impact of Sundowning on Caregivers

Sundowning does not only affect the person with dementia — it takes a profound toll on caregivers as well. The unpredictable and often distressing nature of evening episodes can lead to chronic sleep deprivation, emotional exhaustion, and caregiver burnout. Research has shown that sundowning is one of the primary reasons families seek institutionalization or transition a loved one to residential memory care.

If you are a caregiver managing sundowning, it is essential to seek support. Connect with local caregiver support groups, contact the Alzheimer’s Association 24/7 Helpline at 1-800-272-3900, or explore respite care options that give you time to rest and recharge. You cannot provide effective care if you are running on empty, and asking for help is a sign of strength, not failure.

How Azura Memory Care Supports Residents with Sundowning

At Azura Memory Care, we understand that sundowning is one of the most challenging aspects of dementia for both residents and their families. Our care teams are specifically trained to recognize the early signs of sundowning episodes, apply evidence-based de-escalation techniques, and create evening environments that minimize triggers and maximize comfort.

Our approach includes consistent daily routines anchored by morning light exposure and structured activities, calm and soothing evening programming designed to ease the transition from day to night, personalized care plans that identify each resident’s unique sundowning triggers and preferences, and compassionate, patient communication strategies rooted in our MOSAIC philosophy of empathy, respect, and purposeful living. We believe that every person living with dementia deserves to feel safe, understood, and cared for — especially during the most vulnerable hours of the day.