Sundowning in Dementia: Causes and Tips for Families

Many families notice the same pattern. Mornings with Mom are fairly good, but as the light fades she becomes restless, anxious, suspicious or determined to "go home," even when she is home. By bedtime everyone is exhausted. This late day shift has a name: sundowning. It is common in Alzheimer's disease and other dementias, it is not anyone's fault, and while it cannot always be prevented, it can often be eased. This guide explains sundowning in dementia, its causes and tips that families and care teams use to make evenings calmer. It also covers the warning signs that mean something else may be going on and a doctor should be involved.

What sundowning looks like

The Alzheimer's Association describes sundowning as increased confusion that can start at dusk and continue into the night. It may show up as anxiety, agitation, pacing, difficulty sleeping, disorientation and, in some people, hallucinations. Your parent may ask the same question over and over, try to leave the house, accuse someone of taking their things, shadow you from room to room or become tearful without an obvious reason. Some people become angry or resist help with the evening routine, such as changing clothes or taking medication. Sundowning does not happen to everyone with dementia, and it can come and go. A parent may have several difficult evenings in a row and then a calm week. Keeping a simple log of when episodes start, what happened beforehand and what helped is one of the most useful things a family can do, because patterns are much easier to see on paper than in the moment.

The medical side: the body clock, fatigue and hidden discomfort

There is no single explanation for sundowning, but several factors are well recognized. The first is the circadian rhythm, the internal clock that regulates sleep and wakefulness. Dementia can disrupt the brain regions involved in this clock, so a person may feel drowsy in the day and alert or unsettled at night. Normal aging already tends to lighten and fragment sleep, which adds to the problem. Mental and physical exhaustion matter too. By late afternoon a brain working hard to make sense of the world simply has fewer reserves. Lighting plays a role as well: low evening light creates shadows and reflections that can be misread as people or threats, especially when eyesight is also declining.

It is equally important to rule out physical causes. The Alzheimer's Association recommends asking a doctor to check for conditions such as urinary tract infections, sleep apnea or restless legs syndrome. Pain, constipation, hunger, thirst and the side effects of medications can also show up as evening agitation in someone who cannot explain how they feel. A sudden worsening over hours or days is a different situation altogether: it can be delirium, an acute confusional state often triggered by infection, dehydration or a new medication. Delirium is a medical problem that needs prompt attention, so do not assume that every change is just the dementia getting worse.

The psychology behind evening distress: a lowered stress threshold

A helpful way to understand sundowning comes from nursing research on dementia: the Progressively Lowered Stress Threshold model, developed by Geri Hall and Kathleen Buckwalter. The idea is that as dementia progresses, a person's ability to tolerate stress shrinks. Behaviors such as agitation, pacing or night waking appear when internal demands (pain, fatigue, hunger) or external ones (noise, crowds, a change in routine) exceed that lower threshold. The model also proposes that the threshold follows a daily rhythm, highest in the morning and lowest in the evening. Seen this way, sundowning is not stubbornness or a deliberate attempt to make life hard. It is a signal that the day's demands have added up beyond what your parent can manage.

This perspective is useful because it points straight to solutions. If stress accumulates over the day, then reducing demands, building in rest and lowering stimulation before evening should help. It also explains why the same request, such as a shower or a visit from a large group, may go smoothly at ten in the morning and badly at five in the afternoon. Many families find that once they stop seeing evening behavior as a problem to correct and start seeing it as a full cup that is spilling over, they react with more patience, and their parent picks up on that calm.

Practical tips for calmer evenings

Understanding sundowning in dementia, its causes and tips that work in daily life go hand in hand, because most strategies target one of the triggers above. Expect some trial and error: what calms one person may irritate another. These are the approaches most often recommended by organizations such as the Alzheimer's Association:

• Keep a predictable routine for waking, meals, activities and bedtime, so the day has a familiar shape.
• Schedule demanding tasks, outings, appointments and bathing for the morning or early afternoon, when your parent is usually at their best.
• Get outside in daylight or sit by a bright window during the day, which supports the body clock.
• Turn lights on and close curtains before it gets dark, so the transition to evening is gradual and shadows are fewer.
• Limit daytime naps, and keep any nap short and early in the afternoon.
• Reduce caffeine, alcohol and nicotine, especially later in the day.
• Lower the noise in the evening: switch off loud TV news, keep visits small and avoid busy outings.
• Offer soothing activities as dusk approaches, such as favorite music, a photo album, folding towels or a hand massage.
• Make sure basic needs are met: a snack, a drink, a trip to the bathroom and comfortable clothing.

During an episode, stay calm and keep your voice low. Listen to what your parent is trying to say, since agitation is often an attempt to communicate a need or a worry. Avoid arguing about facts; reassure, offer comfort and, if needed, gently redirect to another room or activity. If they want to go home, they may be expressing a wish to feel safe, so acknowledging the feeling usually works better than explaining that they already are home. If your parent's sleep has been changing for other reasons too, our guide on why sleep changes in older adults and how to improve it offers more background.

Sundowning in a senior living community

If your parent lives in assisted living or a memory care unit, the same principles apply, but you are no longer the one watching every evening. Experienced care teams know sundowning well, and many plan quieter late afternoon programs, adjust lighting and stagger shift changes because staff comings and goings can be unsettling. When discussing sundowning in dementia, causes and tips with the team, ask what patterns they have noticed, what calms your parent and whether anything has changed recently, such as new medications, poor sleep or signs of pain. Share what you know about their history too: the music they love, the job they had, the time they used to come home from work. These details help staff respond in ways that feel familiar. When evening distress becomes hard to manage safely at home, it can be one of the reasons families consider a specialized setting; our article on signs your mom needs memory care can help you think it through.

Palermia makes these conversations easier when you are not there in person. Through the app, the community can share photos from your parent's day, what and how much they ate, and their medication updates, and you can send a direct message to the care team to ask how the afternoon went or to suggest something that usually soothes them. Over time, that shared picture helps everyone spot patterns earlier. See how it works

When to call the doctor, and how to look after yourself

Talk to your parent's doctor if sundowning is new, getting worse quickly, putting anyone at risk or seriously disrupting sleep for the whole household. Experts generally prefer non drug approaches first, but a doctor can look for treatable causes, review current medications and discuss options if behavioral strategies are not enough. Never start or stop medication without medical advice. Finally, remember that evenings are hard for caregivers too. Fatigue lowers your own patience at the very moment your parent most needs calm. Ask for help in the evenings when you can, take turns with siblings or friends, and accept that some nights will be difficult despite your best efforts. Knowing about sundowning in dementia, its causes and the tips above gives you a starting point, not a guarantee. Managing it is not about getting every evening right. It is about making more evenings gentle, for both of you.