Sundowning in Older Adults: What It Is and How Families Can Help
If your mom is calm and pleasant all morning but grows anxious, restless, or confused as the afternoon fades, you are not imagining it — and you are not doing anything wrong. There is a name for this pattern: sundowning.
Sundowning is one of the hardest parts of caring for someone with dementia — and it tends to arrive when you are tired yourself. This guide explains what it is, what likely causes it, and the practical things that may help your evenings run more peacefully. None of this is a diagnosis or treatment plan; it is information to understand and share with your loved one’s doctor.
What sundowning looks like
Sundowning is not a disease of its own. It is a pattern: in the late afternoon, evening, or night, a person living with dementia may show a new or worsening cluster of symptoms — agitation, confusion, anxiety, or sometimes aggressiveness — that were milder or absent during the day. A 2016 review of the research describes it as the emergence or increase of these neuropsychiatric symptoms during the later hours of the day.
In practice, it can look like: – Restlessness, pacing, or fidgeting that starts as dinner approaches – Confusion that is noticeably worse than in the morning — not recognizing rooms, repeating questions, getting mixed up about the time – Anxiety, tearfulness, or mood swings that seem to come from nowhere – Suspicion or paranoia, such as believing something has been stolen or that “someone is in the house” – In some cases, seeing or hearing things that are not there – Difficulty settling down for the night, and wakefulness after dark
Episodes often ease by morning, then return the next evening. That daily rhythm is the hallmark: the symptoms follow the clock. Sundowning is highly prevalent among people with dementia, though researchers still debate the exact clinical definition — so reported rates vary widely depending on the setting.
What likely causes sundowning
There is no single proven cause — the exact mechanism is still debated — but researchers and care organizations have settled on a familiar set of likely contributors. Understanding them is genuinely useful, because each one points to something you can adjust.
The body clock loses its grip. Dementia can damage the suprachiasmatic nucleus, the small region in the brain that works as the body’s master clock, and melatonin production often declines. When the internal day–night signal weakens, the transition from daylight to darkness can leave a person confused about what time it is and what should be happening. The Alzheimer’s Association lists disrupted circadian rhythm among the main suspected causes.
Fatigue piles up. By late afternoon, someone with dementia has spent the whole day working hard just to follow conversation and surroundings. Mental exhaustion lowers their ability to cope — so small things, like moving shadows or background noise, can trigger a bigger reaction.
Light and shadows change. As daylight fades, dim rooms fill with shadows. A person who already has trouble interpreting what they see may misread a shadow as a stranger, or find a familiar room suddenly frightening. This is one of the most fixable triggers, as you will see below.
Unmet physical needs. Hunger, thirst, pain, constipation, or needing the bathroom are common evening triggers — especially when the person cannot easily say what is wrong.
Environmental and social factors. Fewer people are around in the evening, routines loosen, and the house may get louder (cooking, TV, family coming home) or eerily quiet. Both overstimulation and understimulation can contribute.
Medications. Some drugs can worsen late-day confusion, including anticholinergics, certain sleep aids, and some antidepressants or antipsychotics. Never adjust medication on your own — but a full medication review is one of the most valuable things a doctor can do.
What the circadian research says: a hopeful new direction
The “broken body clock” theory is more than a metaphor. In October 2025, researchers in the lab of Dr. Erik Musiek at Washington University School of Medicine in St. Louis published findings in Nature Neuroscience that connect the dots in a striking way: in mice modeling Alzheimer’s disease, the circadian rhythms inside particular brain cells — the glia, the brain’s support cells — were disrupted in ways that changed how and when hundreds of genes regulated key brain functions.
One detail stood out: of the roughly 82 genes associated with Alzheimer’s risk, about half are controlled by the circadian rhythm. That suggests correcting circadian rhythms could become a meaningful therapeutic direction. For families, the takeaway is encouraging: protecting a loved one’s daily rhythm — regular mornings, real daylight, predictable evenings — is aligned with where the science is pointing.
Practical evening strategies that may help
No strategy can reliably prevent sundowning, but these caregiver-tested approaches are backed by dementia organizations and may reduce how often and how intensely episodes occur.
1. Keep the day predictable. A consistent routine for waking, meals, activities, and bedtime is the single most-recommended step. If your loved one does best in the morning, move appointments, bathing, and outings earlier in the day — the NIA and the Alzheimer’s Association both emphasize this.
2. Get real daylight in the morning. Sit by a bright window, take a short walk, or spend time outside. Morning light is the strongest signal for a struggling body clock. (Our article on how sleep changes after 50 covers the light-and-sleep connection in more detail.)
3. Turn the lights on before the shadows arrive. As late afternoon approaches, switch on lamps throughout the house to soften the transition from daylight to evening. Nightlights in hallways and bathrooms also help reduce confusion after dark. Avoid leaving your loved one in a darkening room.
4. Dial down noise and clutter in the evening. Reduce TV volume or switch it off, postpone loud chores like vacuuming, and keep the room calm. Visual clutter can be as disorienting as noise — a tidy, familiar space feels safer.
5. Meet physical needs before evening. Offer a comfortable meal earlier rather than later, keep water available all day, and take a bathroom trip before the restless hours begin. Check for pain — an untreated sore joint or a too-tight shoe can drive agitation no one can explain.
6. Skip caffeine and heavy late meals. Avoid coffee, strong tea, cola, and large late dinners, which can worsen restlessness. A simple, calming evening snack is a kinder choice.
7. Try calm, familiar music. Soothing music your loved one recognizes can lower agitation and give the evening a gentler shape. There is growing evidence that familiar music is one of the simplest, most pleasant tools in dementia care — we explored why in how music may support brain health in dementia.
8. When an episode starts: redirect, don’t argue. Do not physically restrain your loved one — it can make agitation worse. Stay calm, speak gently, and avoid correcting or arguing with confused statements. Instead, redirect attention: offer a walk, a familiar photo album, a snack, or a favorite song. Sometimes simply moving to another room breaks the cycle. Note what happened before the episode so you can spot patterns — the Alzheimer’s Association suggests keeping a brief log of triggers.
9. Take care of yourself, too. Your stress is contagious — a person with dementia picks up on nonverbal tension. Rest when you can, accept help, and know that reaching out for support is part of good care, not a failure.
A note on treatments like bright light therapy and melatonin: they have been studied with some promising signals, but the evidence is still limited. An Ohio State study, for example, found that melatonin alone did not reduce sundowning-like anxiety in mice — problems with the brain’s cholinergic system mattered more. Treat these approaches as “may help,” not fixes, and discuss any sleep aids or supplements with the doctor first. Never use sedating medications to manage behavior without medical guidance.
When it escalates: sundowning or delirium?
This distinction matters. Sundowning follows a pattern — it arrives in the late afternoon or evening and tends to ease by morning. Delirium comes on suddenly — over hours or a day — and may include severe confusion, disorientation, or hallucinations at any time of day. Delirium is often triggered by an infection (such as a urinary tract infection), dehydration, pain, or a medication change, and it is a medical emergency that needs prompt evaluation.
Because the two can look alike, treat any sudden or dramatically worse evening confusion as a reason to call the doctor right away — not just a bad sundowning night. If evening confusion is a brand-new pattern, also compare it with the early signs of dementia that families often miss. A quick medical check can rule out the reversible causes, and catching a UTI or a drug interaction early genuinely helps.
When to see a doctor
Make an appointment with your loved one’s doctor if:
- Sundowning episodes are new, or noticeably worse than before
- Agitation, confusion, or hallucinations are severe, last long, or feel unsafe
- There is a sudden change in behavior — possible delirium, which deserves urgent care
- You are considering any sleep aid, supplement, or medication change
- Episodes are happening even with a good routine, light, and physical needs covered
- You, the caregiver, are exhausted — ask about respite options and local support services
Bring your notes about what happens before episodes: the time, what the room looked like, what the person ate and drank, and any recent medication changes. That log is one of the most useful things you can hand a clinician.
Sources
- Alzheimer’s Association — Sundowning fact sheet (PDF). https://stage.alz.org/media/Documents/alzheimers-dementia-sundowning-ts.pdf
- National Institute on Aging — “Coping With Agitation, Aggression, and Sundowning in Alzheimer’s Disease.” https://www.nia.nih.gov/health/alzheimers-changes-behavior-and-communication/coping-agitation-aggression-and-sundowning
- National Institute on Aging — “Managing Sleep Problems in Alzheimer’s Disease.” https://www.nia.nih.gov/health/sleep/managing-sleep-problems-alzheimers-disease
- Khachiyants, N., et al. — “Sundowning syndrome in the older patient.” https://www.researchgate.net/publication/286957405_Sundowning_syndrome_in_the_older_patient
- News-Medical — “Disruption of glial circadian rhythms linked to Alzheimer’s disease progression” (WashU Medicine / Nature Neuroscience, Oct 23, 2025). https://Www.News-Medical.Net/news/20251023/Disruption-of-glial-circadian-rhythms-linked-to-Alzheimers-disease-progression.aspx
This article is for general information only and is not medical advice. If you are caring for someone with dementia and notice changes in behavior — especially sudden confusion — please talk to a qualified healthcare professional. James Carter is a health writer and editor, not a medical professional.
