Nursing care
Dementia Behavioural Symptoms, explained for the bedside and the exam
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Dementia behavioural symptoms are the agitation, wandering, resistance to care, and sundowning that accompany cognitive decline, arising from unmet needs, environmental overstimulation, or the disease process itself rather than deliberate behaviour. The core nursing response is to redirect rather than reorient, since arguing with a false belief escalates distress instead of resolving it.
Defining it precisely
Behavioural and psychological symptoms of dementia cover agitation, aggression, wandering, repetitive questioning, resistance to hygiene or dressing care, hallucinations, and sundowning. They are not a separate diagnosis; they are the clinical expression of a brain that can no longer process environment, memory, and communication the way it once did.
These symptoms are communication. A patient who becomes combative during a bed bath is often expressing pain, fear, or overstimulation, not defiance. A patient who insists it is time to collect the children from school is often expressing a need rooted in a long-held routine, not confusion for its own sake.
Sundowning specifically refers to increased confusion, agitation, and restlessness in the late afternoon and evening. It is common in moderate to severe dementia and has a physiological basis tied to circadian rhythm disruption, fatigue accumulating over the day, and reduced light cues as evening approaches.
The exceptions that matter
Not every behavioural change in a person with dementia is dementia. New or worsening agitation, especially with acute onset, should prompt a check for delirium first, since infection, pain, constipation, dehydration, or a medication effect can all present as sudden behavioural change layered on top of existing cognitive impairment.
Redirect rather than reorient is the standing principle, but it has a limit. Reorientation still has a place for patients with mild impairment who retain insight and are distressed by their own disorientation; forcing reality on a patient with advanced dementia who has lost that insight only produces conflict.
Safety overrides technique. If a behaviour places the patient or others at immediate risk, such as attempting to leave a locked unit or striking out during care, the priority shifts to de-escalation and safety first. Redirection is the long-term strategy, not a substitute for stopping harm in the moment.
Using it to prioritise
When a patient with dementia insists a deceased spouse is arriving for a visit, correcting them with the fact of the death causes fresh grief each time and frequently triggers agitation. Redirecting toward a related, comforting activity, such as looking at photographs or talking about a shared memory, meets the emotional need without the confrontation.
For sundowning, the intervention is largely non-pharmacological and centres on routine, light, and rest. Maintain a consistent daily schedule, increase ambient lighting before dusk to blunt the shift from natural to artificial light, limit caffeine and long daytime naps, and schedule demanding tasks like bathing earlier in the day rather than the late afternoon.
When prioritising interventions across a patient assignment, behavioural symptoms driven by an unmet physical need come first: pain, hunger, a full bladder, an uncomfortable position. Only after ruling those out does the plan move to environmental and psychosocial strategies like redirection and routine.
Traps in exam wording
A stem describing a patient who insists their spouse, dead for years, is on the way will often offer a distractor answer that involves gently informing the patient of the death. That answer feels honest but is wrong; the tested principle is redirection, not correction.
Watch for stems that use the word "reorient" as the correct-sounding answer for advanced dementia. Reorientation is appropriate early in the disease and in delirium, but for moderate to severe dementia with sundowning or fixed false beliefs, the better answer nearly always involves distraction, validation of the underlying emotion, or environmental change.
A stem describing acute-onset agitation in a patient with dementia, particularly with a recent UTI, fall, or new medication, is testing whether you rule out a reversible medical cause before defaulting to a dementia-behaviour intervention. Choosing a purely behavioural answer when the stem hints at an acute trigger is the common wrong choice.
Examples from practice
A patient with moderate dementia becomes agitated at 5pm, pacing the corridor and trying to open the exit door. The nurse does not argue that it is not time to go home. Instead, the nurse walks with the patient, offers a warm drink, dims overhead lights while turning on lamps, and settles the patient into a familiar chair with a folded blanket to fold and refold, a repetitive task that channels the restlessness.
A patient resists having their teeth brushed, pushing the nurse's hand away and becoming tearful. Rather than persisting with the original approach, the nurse pauses, hands the patient the toothbrush to hold, offers simple one-step instructions, and tries again a few minutes later with a calmer approach and a familiar staff member present.
A patient repeatedly asks where their mother is, though the mother died decades ago. The nurse responds by asking the patient to describe their mother, validating the feeling of missing her, and then moving into a related activity rather than stating the mother has died.
Summary
Dementia behavioural symptoms are communication from a patient whose usual channels of expressing need have narrowed. Treat the behaviour as data before treating it as a problem to suppress.
Redirect rather than reorient in moderate to severe dementia, reserve reorientation for early-stage insight-retaining patients, and always rule out an acute reversible cause before attributing new agitation to the disease itself.
For sundowning specifically, the treatment is routine, light, and rest, not sedation as a first-line response. Build the daily schedule around the pattern rather than reacting to it each evening.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our neurological practice questions are the closest set to what this page covers.
Common questions
What is sundowning in dementia patients?
Sundowning is increased confusion, agitation, and restlessness that occurs in the late afternoon and evening in patients with moderate to severe dementia. It relates to circadian rhythm disruption, fatigue, and reduced daylight cues, and is managed primarily through consistent routine, adequate lighting, and rest rather than medication.
Should a nurse correct a dementia patient who believes something false?
Generally no, once the patient is past mild-stage insight. Arguing with a false belief tends to increase distress and agitation without changing the belief. Redirecting attention toward a related, calming activity or validating the underlying emotion is the preferred approach.
What is the first step when a dementia patient suddenly becomes more agitated?
Rule out an acute medical cause before assuming disease progression. Check for infection, pain, constipation, dehydration, and recent medication changes, since sudden agitation layered on existing dementia often signals delirium rather than a worsening of the dementia itself.
Is redirection the same as distraction?
They overlap but are not identical. Redirection specifically moves the patient away from a distressing thought or behaviour toward a related, meaningful activity, while distraction is a broader term for shifting attention to anything engaging. In dementia care, redirection toward something emotionally relevant tends to work better than a generic distraction.