Sundowning means that confusion, restlessness, irritability or agitation start or get worse as daylight fades, usually in the late afternoon or early evening. It is not a disease but a set of dementia-related behaviors, and it often has triggers you can change: tiredness, dim light, noise, hunger, pain, or a long nap too late in the day.
What is sundowning, and what is it not?
The National Institute on Aging (NIA) describes sundowning as agitation, restlessness, irritability and confusion that appear or worsen as daylight begins to fade. The Alzheimer’s Association says it is “not a disease” but a group of symptoms that may include trouble sleeping, anxiety, agitation, hallucinations, pacing and disorientation. It describes the timing as from dusk through the night. The exact cause is unknown.
What can set off sundowning?
The Alzheimer’s Association lists several factors that may contribute: exhaustion after a full day, a new or confusing environment, a mixed-up internal body clock (tired by day, awake at night), low light that creates shadows, picking up stress from people nearby, and dreams that blur with reality. The NIA adds that being overly tired can increase late-afternoon and early-evening restlessness.
The NIA’s wider list of causes of agitation works as a checklist: pain, depression or stress, too little sleep, constipation, a sudden change in a familiar place, routine or person, too much noise or too many people in the room, being pushed to do something that has become too hard, loneliness, and certain medications or combinations of medications.
Is it sundowning, or something else that needs a doctor?
Do not assume every evening change is sundowning. The NHS says that if a change in behavior comes on suddenly, the cause may be a health problem such as pain, constipation or an infection, and to ask a doctor for an assessment.
Delirium is the one to rule out first. MedlinePlus describes delirium as sudden severe confusion, usually temporary and reversible. Causes include infections such as urinary tract infections and pneumonia, certain medicines, and severe lack of sleep. It also lists changes in alertness, usually more alert in the morning and less alert at night, so it can look a lot like sundowning. Only a clinician can tell them apart. Our page on delirium versus dementia explains the difference in more detail.
The Alzheimer’s Association also names urinary tract infections, incontinence, restless legs and sleep apnea as conditions that can cause or worsen poor sleep.
Trigger by trigger: what to try
| Possible trigger | What to try |
|---|---|
| Fading light, shadows | Keep the home well lit in the evening (Alzheimer’s Association). Use nightlights or automatic light sensors (NIA). |
| Tiredness, late or long naps | Keep a schedule, discourage long naps and late-day dozing, and do not overload the day (NIA). |
| Body clock mixed up | Get outside or sit by a window for sunlight each day (NIA). Keep regular times for waking, meals and bed (Alzheimer’s Association). |
| Caffeine, alcohol, nicotine | Skip coffee, cola and alcohol late in the day (NIA). The Alzheimer’s Association adds nicotine. |
| Noise and busy rooms | Reduce noise, clutter and crowding (NIA). Avoid TV, chores or loud music in the evening (Alzheimer’s Association). |
| Hunger or thirst | Make sure the person has plenty to eat and drink (NHS). Offer a larger lunch and a lighter evening meal (Alzheimer’s Association). |
| Pain, constipation, infection | Tell the doctor, especially if the change is new or sudden (NHS, NIA). |
| Medication timing | Ask the doctor about the best time of day to give medicines (Alzheimer’s Association). |
What daytime habits help prevent sundowning?
The NIA suggests sticking to a schedule, getting sunlight each day, staying physically active without planning too many activities, and avoiding alcohol, coffee and cola late in the day.
The Alzheimer’s Association suggests planning appointments, outings and bathing for the morning or early afternoon, when the person is usually more alert. The NHS recommends keeping a diary for one to two weeks to spot triggers, such as a certain time of day, a noisy or cluttered home, or being asked to do something the person does not want to do.
What helps in the late afternoon and evening itself?
Aim for a quiet, predictable evening. The Alzheimer’s Association suggests soothing activities such as calm music, looking at photographs or watching a favorite movie. The NIA suggests redirecting with a snack, a drink, a favorite show, music, a walk or a simple household chore such as folding laundry together.
If the person is awake and upset, the Alzheimer’s Association advises:
- Approach them calmly.
- Find out whether they need something.
- Gently remind them of the time.
- Avoid arguing and offer reassurance that everything is all right.
- Allow pacing with supervision rather than restraining them.
At bedtime, MedlinePlus suggests calm activities, the same bedtime every night, and no loud noise or activity in the home at night. The NHS adds a nightlight or blackout blinds if needed.
What should you not do?
- Do not argue or correct. The NIA says to listen to the person’s concerns and avoid arguing, and to reassure them that they are safe.
- Do not use physical restraint. The Alzheimer’s Association says not to, and MedlinePlus says not to restrain a person with dementia in bed or during an angry outburst unless safety requires it. None of the guidance reviewed for this page recommends locking someone into a room.
- Do not reach for over-the-counter sleep aids. MedlinePlus says to talk with the health care provider first, because many sleep aids can make confusion worse.
- Do not take it personally. MedlinePlus says so, and the Alzheimer’s Association notes that people may pick up on stress or frustration around them.
Why does my parent wander or get up at night?
The NHS says dementia can disturb the body clock, so a person may get up repeatedly during the night, unaware that it is night. If a night behavior is new, such as a parent suddenly coming into your bedroom, treat it as a possible medical change and tell the doctor.
Falls are the main danger. The NIA notes that depth perception often changes in Alzheimer’s, so a change in floor pattern can look like a step. Its home safety guidance suggests nightlights or light sensors and a room monitor like those used for infants, so you hear a fall or a call for help at night.
For wandering, the NIA’s wandering page suggests an ID bracelet, a GPS tracker, a door alarm or smart doorbell that chimes, and telling neighbors. It also says not to leave a person with a history of wandering unattended.
When to call the doctor and when to call 911
| Call the doctor soon | Call 911 (or the local emergency number) |
|---|---|
| Evening agitation or poor sleep keeps happening, or home strategies are not working (Alzheimer’s Association) | Confusion comes on suddenly with cold or clammy skin, dizziness or fainting, fast pulse, fever, headache, slow or rapid breathing, or uncontrolled shivering (MedlinePlus) |
| A behavior change is sudden or new, which may point to pain, constipation or infection (NHS) | It is the first time the person is confused for no reason (MedlinePlus) |
| Aggressive behavior is getting worse (NIA) | Confusion follows a head injury, or comes on suddenly in someone with diabetes (MedlinePlus) |
| You suspect a medicine is involved, or you are thinking about a sleep aid (MedlinePlus) | The person is in danger of harming themselves or others, or becomes unconscious (MedlinePlus, NIA) |
When you call 911, tell them the person has dementia.
Evening home safety checklist
Run through this before the light fades. Items come from the NIA’s home safety tips and wandering page.
- Lights on and nightlights or automatic light sensors installed, including the path to the bathroom.
- Stove with safety knobs or an automatic shut-off; signs near hot appliances.
- Smoke and natural gas detectors working.
- Medicines, alcohol, cleaning products and sharp items locked away.
- Door chime or alarm working; shoes, keys and coats out of sight.
- Bathroom grab bars and nonskid strips; emergency numbers and the address posted by the phone.
- Room monitor on, and a plan for who is awake and listening.
Sundowning and calm at home: advice from our nurse director
Anna Klyauzova, RN, MSN, MPA, Director of Patient Services at ProLife Home Care, on what she sees in practice:
You can’t do all of it by yourself. Alzheimer’s and other dementias change the whole family’s life, not only the patient’s. The sooner support is in place, the easier it is to keep a familiar routine and a safe home. Even a few hours of professional home care a week gives relatives time to rest.
Families rarely hear this: don’t argue with the person and don’t keep correcting mistakes. If your mother asks the same question for the fifth time, she isn’t doing it on purpose. A calm voice, a familiar room and a routine she can predict usually work better than long explanations.
How can an aide or live-in caregiver cover the evening hours?
Many families manage the day and run out of strength just when sundowning peaks. Paid help can be arranged around that window. A home health aide for dementia care can be scheduled for the late afternoon and evening. Depending on the nurse-written care plan, that can mean help with dinner, keeping lights and routine steady, a walk, noticing what happens before an episode and passing it on, and staying through the bedtime routine. Under Medicaid home care, an assessor looks at mobility, cognition and fall risk, so describe the evenings and nights honestly. Our in-home care page covers the other routes.
If nights are the problem, live-in care places one caregiver in the home, and ProLife lists overnight presence and supervision as part of it, with the plan written and supervised by a New York State-licensed registered nurse. Ask any agency exactly how overnight coverage and the caregiver’s own rest are arranged. If you are the one who is exhausted, respite care gives you cover for a night or a weekend, and our Alzheimer’s care page shows what is available. Decisions about medicines stay with the doctor.
You can also call the Alzheimer’s Association 24/7 Helpline at 800-272-3900. It is free and staffed around the clock.
What is paradoxical lucidity?
The NIA describes paradoxical lucidity as temporary periods of meaningful communication and connection in people with advanced dementia, and supports research on it. A 2023 pilot study from New York researchers says there is little systematic evidence about it. It is a different thing from sundowning, which is a worsening, and none of the sources reviewed says it can be predicted. Treat a good moment as a good moment, and keep the usual plan.
Need help with the late-day hours?
ProLife Home Care is a licensed home care agency in Brooklyn and Queens (New York State Department of Health licence #2572L001). If evenings have become the hardest part of the day, call (718) 232-2777 or use our contact page. This page is general information, not medical advice.
Checked on 9 October 2026 against nia.nih.gov, alz.org, nhs.uk and medlineplus.gov. Guidance changes, and every person with dementia is different, so confirm what applies to your family with their doctor.
Frequently asked questions
What time does sundowning start?
The NIA ties it to the late afternoon or early evening, as daylight fades. The Alzheimer’s Association describes it as lasting from dusk through the night. Watch for your own family member’s pattern.
Is sundowning a disease?
No. The Alzheimer’s Association says it is a set of symptoms or dementia-related behaviors. The cause is unknown, though tiredness, poor light and a disturbed body clock may contribute.
Is sundowning the same as delirium?
No, but they can look alike. Delirium is sudden severe confusion with a physical cause such as an infection or a medicine, and it is usually reversible. If confusion is new or abrupt, call the doctor. See our page on delirium versus dementia for more.
Can medication treat sundowning?
The Alzheimer’s Association says most experts encourage non-drug measures first. When those fail, a doctor may prescribe medication for late-day agitation after discussing risks and benefits. Many store-bought sleep aids can make confusion worse (MedlinePlus), so ask first.
Should I lock my parent’s bedroom door at night?
The guidance reviewed for this page does not recommend it, and the Alzheimer’s Association says not to use physical restraint. Door alarms, a room monitor, nightlights, ID and supervision are the options the NIA lists. Ask the doctor or a nurse about a safer plan.
Can someone with dementia be left alone at night?
The NIA says not to leave a person with a history of wandering unattended, and MedlinePlus says a confused person should not be left alone. If you cannot cover the nights yourself, a live-in caregiver or an evening aide is one way to do it.
Does paradoxical lucidity mean my parent is getting better?
The sources reviewed do not say so. It is described as a temporary period of clear communication in advanced dementia, and researchers say systematic evidence is limited. Enjoy the moment and keep the care plan in place.
