Sundowning is a late-day worsening of restlessness, agitation, irritability, or confusion in someone with dementia, according to the National Institute on Aging. Its exact cause is unknown, but brain and sleep-wake changes, fatigue, stress, and confusing surroundings may contribute; predictable days and calm, well-lit evenings can help. New or worsening symptoms deserve medical attention. Pain, poor sleep, depression, constipation, or medication effects can resemble or intensify sundowning and may be treatable.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What sundowning can look like
- Why does it happen?
- How to reduce late-day episodes
- What to do during an episode
- When to involve a clinician
What sundowning can look like
Symptoms usually emerge or worsen in the late afternoon or early evening as daylight fades. The person may become anxious, irritable, restless, confused, or disoriented.
Some people pace, have hallucinations, or struggle to fall or stay asleep. The pattern can affect people with Alzheimer's disease and other dementias.
Why does it happen?
There is no single established cause. The Alzheimer's Association's guidance on sundowning identifies several plausible contributors, including dementia-related brain and circadian changes. Circadian changes disrupt the body's internal day-night timing.
Mental or physical fatigue may accumulate as the day progresses. Low light, shadows, unfamiliar surroundings, excessive noise, loneliness, and stress can add confusion or distress. Physical discomfort and health problems also matter. Pain, constipation, depression, inadequate sleep, abrupt routine changes, and medication effects can trigger or worsen agitation.
How to reduce late-day episodes
A consistent routine can make the day more predictable. The National Institute on Aging recommends regular daylight exposure and daytime activity while limiting factors that may disrupt nighttime sleep.
Practical steps include: No strategy works for every person. Pay attention to whether episodes follow poor sleep, discomfort, noise, schedule changes, or a particular medication time.
- Keep meals, activities, and bedtime on a steady schedule.
- Provide daylight exposure during the day.
- Include suitable daytime activity.
- Avoid late-day caffeine and alcohol.
- Discourage long naps that interfere with nighttime sleep.
What to do during an episode
Lower stimulation and focus on reducing distress. MedlinePlus guidance recommends a calm evening environment, reassurance, orientation cues, familiar soothing activities, and adequate lighting. During an episode:.
- Speak calmly and offer simple reassurance.
- Reduce noise and unnecessary activity.
- Use familiar cues to help the person orient themselves.
- Offer a familiar, soothing activity.
- Turn on enough light to reduce confusing shadows.
When to involve a clinician
Ask a clinician to evaluate symptoms that are new or getting worse. The assessment should consider treatable contributors such as pain, depression, sleep apnea, restless legs syndrome, and medication problems instead of assuming dementia has simply progressed. Non-drug approaches generally come first.
According to the Alzheimer's Association's guidance on sleep treatments, sleep medicines may worsen confusion and are associated with falls and other risks in older adults. Antipsychotic medicines require particular caution because they increase stroke and death risk in older adults with dementia. Medication decisions should therefore be discussed with a clinician who can weigh the specific symptoms and risks.
