What is sundowning?
Sundowning is increased confusion and restlessness that people living with Alzheimer's and other dementias may experience from late afternoon or dusk through the night. As daylight fades, someone who was fairly settled at lunch may become anxious, suspicious, tearful, or determined to leave the house.
It's also called sundowners syndrome, sundown syndrome, or late-day confusion. The Alzheimer's Association describes it as not a disease in itself, but a set of symptoms and dementia-related behaviors.
If you're dealing with it every evening, you are far from alone, and it is not a sign that you're doing something wrong. Sundowning is a well-recognized part of dementia, and there are practical ways to make evenings easier.
Sundowning symptoms: what it looks like
Sundowning looks different from person to person, and even from one evening to the next. Common signs include:
- Restlessness and pacing, rocking, or being unable to sit still.
- Anxiety, fear, or irritability that seems out of proportion to what's happening.
- Increased confusion about where they are, what time it is, or who people are.
- Repeated questions or insisting they need to go somewhere, such as "home", work, or to collect the children.
- Shadowing: following you closely from room to room.
- Suspicion or paranoia, such as believing someone has taken their things.
- Crying, yelling, or lashing out, verbally or physically.
- Seeing or hearing things that aren't there, or misreading shadows and reflections.
- Trouble falling or staying asleep, and being awake and unsettled at night.
- Trying to leave or wander. See our guide to dementia wandering.
Early signs an episode is building
Many caregivers learn to spot the quieter signs that come first: fidgeting with clothes, a worried look, asking the same question again, checking doors, or packing a bag. Stepping in early with reassurance or a calming activity is usually easier than trying to settle a full episode.
What time does sundowning start?
There's no fixed clock time. The National Institute on Aging describes symptoms starting or getting worse in the late afternoon or early evening, and the Alzheimer's Association describes them from dusk through the night. For some people it lasts an hour or two; for others it runs well into the night and disturbs sleep.
Because it tends to follow fading daylight, you may notice the timing shift as the days get shorter or longer. And not everyone follows the classic pattern: Cleveland Clinic notes that for some people, similar symptoms happen in the morning instead.
What causes sundowning?
The exact cause of sundowning is unknown. It's thought to be linked to the way dementia changes the brain as the disease progresses. Several factors seem to contribute, and often more than one is involved:
- A disrupted body clock. Dementia can scramble the internal clock that tells us when to be awake and when to sleep, so a person may feel drowsy in the day and wide awake at night.
- Mental and physical exhaustion after a full or busy day.
- Low light and shadows. As light fades, shadows and reflections can be misread, which may cause confusion, fear, or even hallucinations.
- A new or confusing environment, such as a hospital stay, a move, or visiting guests.
- Picking up on stress around them. People living with dementia are very sensitive to the mood of caregivers and others in the room.
- Confusing dreams with reality after dozing, especially on waking from a late nap.
- Needing less sleep, which is common in older adults, so long evenings can feel restless.
Triggers that can make sundowning worse
Agitation is often a way of communicating a need the person can't put into words. Common triggers include:
- Pain, hunger, thirst, or dehydration.
- Constipation, a full bladder, or an infection such as a urinary tract infection (UTI).
- Too much noise, too many people, or a busy TV in the evening.
- Side effects of medications, or interactions between them.
- Poor sleep the night before, or long naps late in the day.
- Loneliness, boredom, or being rushed or pushed to do something that has become too hard.
Finding and fixing a trigger is often the single most effective thing you can do. Our guide to dementia agitation goes deeper into reading these signals.
Who gets sundowning, and how common is it?
Sundowning is most often seen in people with Alzheimer's disease and other forms of dementia. Cleveland Clinic notes that it can also occur in older people in general, not only those with a dementia diagnosis.
Exact numbers are hard to pin down because studies define and measure sundowning differently. Cleveland Clinic estimates that around 20% of people diagnosed with Alzheimer's experience sundowning at some point.
For context, the Alzheimer's Association's 2026 report estimates that 7.4 million Americans age 65 and older are living with Alzheimer's, and nearly 13 million Americans provide unpaid care for a family member or friend with dementia. That's a lot of families facing difficult evenings.
Does sundowning have stages?
There's no official staging system for sundowning. According to Cleveland Clinic, it usually begins in the middle and later stages of Alzheimer's disease and tends to continue for as long as its triggers are present. Symptoms can change over time as the disease progresses, and some evenings will be much better than others.
What many caregivers do notice is a pattern within a single evening. Not every episode follows it, but it can help to think of it like this:
Early unease
Mild restlessness, fidgeting, repeated questions, or checking doors as the afternoon wears on. This is the best time to step in with a snack, a drink, a walk, or a favorite activity.
Building agitation
Pacing, shadowing, rising worry, or insisting on going "home". Validation and gentle redirection usually work better now than explanations. See when someone with dementia wants to go home.
Peak
The most intense point, which may include crying, anger, suspicion, or trying to leave. Focus on safety, calm, and fewer words.
Settling
Tiredness sets in and the person gradually calms. A quiet, predictable bedtime routine helps the evening end gently.
Sundowning vs. ordinary tiredness
Everyone gets a bit tired and short-tempered at the end of a long day. Sundowning is different in a few important ways:
| Ordinary end-of-day tiredness | Sundowning |
|---|---|
| Slower, sleepier, maybe a little irritable | Restless, anxious, agitated, or fearful |
| Still knows where they are and who you are | Confusion about place, time, or people increases |
| Easily eased by rest or a quiet evening | Rest alone often doesn't settle it, and sleep may be disturbed |
| Logical reassurance works | Logic and correcting facts often make it worse |
| No particular pattern | Tends to recur around the same time most days |
How sundowning is managed
There's no single fix, but most people respond to a combination of prevention during the day and calm, kind responses in the moment. Experts generally recommend trying non-drug approaches first.
During the day: reduce the chances of an episode
- Keep a regular routine for waking, meals, and bedtime.
- Get outside or sit by a bright window during the day.
- Schedule appointments, bathing, and outings for the morning or early afternoon.
- Keep naps short and early, and limit caffeine, alcohol, and nicotine.
- Offer a larger meal at lunch and a lighter evening meal.
- Keep the home well lit as evening falls, and keep the evening quiet.
Our full guide to preventing sundowning walks through a day-long routine in detail.
In the moment: calm, validate, redirect
When an episode starts, check for a physical need first, then approach calmly, acknowledge the feeling behind what they're saying, and gently steer toward something familiar. Arguing, correcting, or restraining almost always makes things worse. Our step-by-step guide on how to calm sundowning covers exactly what to say and do, and how to talk to someone with dementia explains why these approaches work.
Techniques such as validation and reminiscence, talking about treasured memories, are gentle ways to help someone feel safe again. A familiar voice matters too: many people settle faster for a spouse, child, or sibling than for anyone else. That's the idea behind Hamton, which lets families send a call in a trusted, familiar voice when an episode starts. It's a support tool, not a treatment.
Medication
For sleep and evening agitation caused mainly by dementia, the Alzheimer's Association notes that most experts encourage non-drug measures rather than medication. When those aren't enough, a doctor may consider medication, and some types carry real risks for older adults. Always talk through the risks and benefits with the doctor, and check before giving any over-the-counter sleep aid or supplement.
When to see a doctor about sundowning
It's worth raising sundowning with your loved one's doctor even if it feels manageable. Cleveland Clinic advises having symptoms addressed by a healthcare provider so you can make a plan together. Contact the doctor if:
- Confusion or behavior changes suddenly, over hours or days. This needs attention the same day.
- Episodes are becoming longer, more frequent, or more intense.
- They seem to be in pain, are not eating or drinking well, or have new bladder or bowel problems.
- They're awake most of the night, or you suspect a sleep problem such as sleep apnea or restless legs.
- A new medication was started, stopped, or changed recently.
- Anyone's safety is at risk, including yours.
Your loved one may not be able to tell anyone they're in pain or feel unwell, so you may need to be their advocate and ask for checks such as a urine test. Bringing notes on when episodes happen and what seems to trigger them makes the appointment far more useful.
Frequently asked questions
What is sundowning in simple terms?
Sundowning is when a person living with dementia becomes more confused, anxious, or agitated in the late afternoon and evening. It's a pattern of symptoms rather than a separate illness, and it often eases with routine, good light, and calm reassurance.
What time does sundowning usually start?
It usually starts in the late afternoon or early evening, around dusk, and can continue into the night. The exact time varies from person to person, so keeping a simple log for a week or two is the best way to find your loved one's pattern.
Is sundowning a sign that dementia is getting worse?
Sundowning most often appears in the middle and later stages of Alzheimer's, so it can be part of the disease's progression. But worsening can also have a treatable cause such as an infection, pain, or a medication, so it's always worth telling the doctor.
Can someone have sundowning without dementia?
Sundowning is most common in people with Alzheimer's and other dementias, but Cleveland Clinic notes it can also occur in older people in general. Any new, sudden confusion should be checked by a doctor, because it may be delirium.
Does sundowning ever go away?
There's no cure, and it may continue as long as its triggers are present. Many families find that addressing triggers, keeping a steady routine, and responding calmly make episodes shorter and less intense.
Can sundowning happen in the morning?
Yes. Although it's named for the evening, some people experience similar confusion and agitation at other times of day, including the morning. The same approaches of looking for triggers and responding calmly still apply.
Sources
- Alzheimer's Association — Sleep issues and sundowning
- National Institute on Aging — Coping with agitation, aggression, and sundowning in Alzheimer's disease
- Cleveland Clinic — Sundown syndrome
- Alzheimer's Association — 2026 Alzheimer's disease facts and figures
This guide is for general information and support. It is not medical advice and does not replace guidance from a doctor or care team. If someone is in danger, contact emergency services. Read our editorial policy to see how guides are researched and updated.
