Higher-riskArticle link

Is It Sundowning or a Medical Emergency? How to Tell the Difference and What to Do

When evening behaviors like confusion, agitation, or pacing appear, it is easy to worry that something is seriously wrong. Sundowning is a common pattern in dementia where symptoms worsen in late afternoon or early evening due to brain fatigue, sensory overload, and hormonal shifts. However, a sudden, extreme change in behavior that comes on quickly could signal a medical emergency like a urinary tract infection (UTI) or delirium. This guide helps you tell the difference, gives you concrete steps to take, and reassures you that with the right approach, you can keep your loved one safe and calm.

Key points

  • Sundowning is a predictable, consistent worsening of dementia symptoms in the late afternoon/evening; delirium is a sudden, acute change that can happen anytime and is a medical emergency.
  • Always check for physical signs of illness (fever, pain, urinary changes) when behavior changes suddenly.
  • Use warm, amber lighting and a calm environment starting in the late afternoon to reduce sundowning triggers.
  • Keep a journal to identify patterns; consistent timing suggests sundowning, while random or sudden changes suggest a medical issue.
  • If in doubt, call the doctor. It is better to rule out a UTI or infection than to assume it is 'just sundowning.'
  • Stay calm, use simple reassuring phrases, and offer soothing activities like hand massage or a weighted blanket.

What Is Sundowning and Why Does It Happen?

Sundowning is not a disease itself but a symptom of dementia where confusion, anxiety, agitation, pacing, wandering, or even hallucinations become more pronounced in the late afternoon or early evening. It typically happens around the same time each day and tends to be consistent over time. The brain of a person with dementia has to work extra hard to process information throughout the day. After a good night's sleep, the brain functions best in the morning, but as the day goes on, it becomes worn down and struggles to distinguish reality from memories or sensory input. This mental fatigue, combined with hormonal changes, low lighting, and accumulated stress, triggers the sundowning response.

What Is Delirium and Why Is It a Medical Emergency?

Delirium is an acute, sudden change in mental state that can occur at any time of day, not just in the evening. Unlike sundowning, which follows a predictable pattern, delirium comes on rapidly—over hours or a day—and involves a significant, dramatic shift in behavior. The person may become extremely confused, agitated, or withdrawn, and they might not recognize you or their surroundings. Delirium is often caused by an underlying medical issue such as a urinary tract infection (UTI), pneumonia, dehydration, medication side effects, or metabolic imbalances. It is a medical emergency because the underlying cause needs treatment to prevent further harm. Delirium can occur alongside dementia, making it tricky to distinguish from sundowning, but the key difference is the suddenness and severity of the change.

Red Flags: When to Suspect a Medical Emergency Instead of Sundowning

The most important red flag is a sudden, extreme change in behavior that is out of character for your loved one. If they are acting more confused than normal, doing things they do not usually do, or if the agitation appears out of nowhere and is much more intense than their typical sundowning, this could be delirium. Other red flags include a fever, changes in urination (frequency, odor, color), increased confusion that does not improve with calming strategies, new physical symptoms like unsteady gait or difficulty swallowing, or if the person seems to be hallucinating in a way that is new or more severe. If you notice any of these, take your loved one to the doctor immediately, as an infection or other medical issue could be the cause.

General caregiving information, not medical advice. Check medications and major care changes with your clinician.

Step-by-step

  1. Stay calm and observe: note the exact time the behavior started, possible triggers (lighting, visitor, meal, or nothing obvious), and whether it matches yesterday's pattern.

  2. Check for physical signs of illness: feel for fever, ask about pain, and note changes in urination (frequency, odor, color) or bowel movements—infections like UTIs are common triggers.

  3. Apply the 'sudden change' test: if the behavior came on rapidly over minutes or hours and is far more intense than usual, suspect delirium; if it follows a consistent late-afternoon pattern and builds gradually, it is likely sundowning.

  4. Reduce environmental triggers: turn off the TV, switch to warm amber lighting around 4:00 PM, and keep the room quiet to ease the brain's transition into evening.

  5. Offer a small snack and a drink—dehydration and low blood sugar can worsen confusion and mimic both sundowning and delirium.

  6. If the behavior is sudden, extreme, or does not improve within an hour, call the doctor and ask: 'Could this be a UTI or delirium? Should we come in for a urine test or blood work?'

What not to do

  • Do not assume it is just sundowning if the change is sudden and extreme—many treatable UTIs are dismissed as 'just sundowning' and care is delayed.

  • Do not argue, reason, or ask 'why' questions; their brain is overwhelmed and reasoning will increase agitation.

  • Do not leave them alone if they are pacing or wandering—they could fall or get lost; stay nearby and gently guide them to a safe spot.

  • Do not ignore physical symptoms like fever, pain, or changes in urination—these are red flags for infection needing prompt medical attention.

Practical tools

  • The 'Sudden Change' Checklist

    When evening behaviors start, ask: (1) Did this start suddenly over minutes or hours? (2) Is it much more intense than usual? (3) Are there physical symptoms like fever, pain, or urinary changes? (4) Is the person doing things they have never done before? If yes to any, call the doctor; if no to all, it is likely sundowning.

  • Calming Phrases to Say

    In a slow, gentle tone: 'You are safe. I am right here. It is evening time, and we are going to rest now. Let me help you sit down. Would you like to hold this soft blanket?' Avoid questions that require a decision; repeat the same phrase if needed.

  • Warm Amber Lighting Setup

    Starting around 4:00 PM, switch from bright white bulbs to warm amber lamps or nightlights. Use a dimmer if possible, and avoid blue light from screens or harsh overhead fluorescents.

  • Sensory Calming Kit

    Keep a small basket with a weighted lap pad or blanket, a soft stuffed animal, hand lotion for gentle massage, a textured fidget ball, and a playlist of soothing classical or nature music. Offer one item at a time when agitation begins.

  • Journal Template

    Create a log with columns for date, time behavior started, what happened, what you tried, what helped, and any physical signs (fever, pain). Review weekly to spot patterns—a consistent time suggests sundowning; a random or sudden change calls for medical advice.

  • Medical Info Card

    Fill out and keep on the fridge or by the phone: list all current medications and dosages, allergies, baseline behaviors, primary doctor and after-hours number, and preferred hospital. Grab it before any call or ER visit to share accurate information under stress.

Discuss with your clinician

Ask your doctor: 'Could my loved one's evening agitation be caused by a medication side effect? Should we review their current medications?'

Ask: 'If I suspect a UTI, what symptoms should I look for, and how quickly should I bring them in for a urine test?'

Ask: 'Are there any non-drug strategies you recommend for managing sundowning, and when would you consider a medication to help with sleep or agitation?'

Ask: 'If my loved one has a sudden, extreme change in behavior, should I go to the emergency room or call your office first?'

Related guides

Sources