Book a Free Consultation

Dementia Care Guide

Sundowning and dementia care in Ontario: what causes it and what actually helps

Key takeaways

  • Sundowning is late-afternoon and evening agitation, confusion, or restlessness - common in Alzheimer's and other dementias. It is not a separate disease; it is a pattern.
  • Ontario's short winter days can intensify sundowning - reduced daylight disrupts the body's internal clock more severely between November and February.
  • A consistent daily routine, morning light exposure, structured afternoon activity, and a calm evening environment reduce frequency and severity.

Author: Director, Aviora Healthcare
Reviewed by: Aviora Care Coordination Team
Last reviewed: June 2026

A practical guide for Ontario families managing sundowning - what causes it, what makes it worse, and what a caregiver can do during the high-risk hours.

Book a Free ConsultationRead the Guide

TL;DR: Sundowning is one of the most exhausting aspects of caring for someone with dementia at home. The person who has been relatively calm all day becomes anxious, confused, or agitated as afternoon turns to evening - right when family caregivers are also tired. Understanding why it happens and having a consistent strategy for the 3–7 PM window reduces both the frequency of episodes and the toll on the caregiver.

Last reviewed: June 2026  |  Reading time: 6 min

Understanding the pattern

What is sundowning in dementia?

Sundowning is a pattern of increased confusion, agitation, anxiety, or behavioural disturbance that occurs in the late afternoon and early evening in people living with dementia. It is most commonly associated with Alzheimer's disease but occurs across dementia types. The exact cause is not fully understood. Current thinking points to disruption of the circadian rhythm - the internal body clock - along with cumulative fatigue and reduced ability to cope with sensory information as the day progresses.

Common sundowning behaviours include:

  • Increased agitation, restlessness, or pacing between approximately 3 PM and 7 PM
  • Confusion about where they are or what year it is - more pronounced than earlier in the day
  • Anxiety, tearfulness, or emotional upset that seems disproportionate to the situation
  • Attempts to leave the home or repeated requests to "go home" (even when already home)
  • Difficulty settling for the evening, resistance to dinner or bedtime routines
  • Suspicion or accusatory statements that are absent earlier in the day

Related: see our guide on dementia wandering and home safety in Ontario, which covers the exit-attempt risk that often accompanies sundowning hours.

Why sundowning can be worse in Ontario winters

Ontario winters are characterized by very short daylight hours - in December, sunset in Kitchener occurs around 4:30 PM, and in Thunder Bay even earlier. For people with dementia, this matters because the circadian clock relies heavily on light cues to regulate sleep and wakefulness.

When daylight disappears by mid-afternoon, the brain receives conflicting signals. Combined with the social isolation that cold weather can create - fewer outdoor walks, less visitors - winter in Ontario can intensify sundowning patterns that are manageable in summer. Light therapy lamps (10,000 lux, used for 30 minutes in the morning) are used by some families to compensate. Speak with the person's physician before starting light therapy if they have certain eye conditions.

What helps during sundowning hours

The most effective strategies work on routine, environment, and engagement:

  • Morning physical activity - even a short walk helps regulate the sleep-wake cycle
  • Consistent daily routine - predictability reduces anxiety across the whole day
  • Reduce stimulation after 3 PM - turn off the TV news, lower noise, dim bright overhead lights
  • Structured activity - music from their era, a simple familiar task, or a calm walk
  • A nutritious snack around 3–4 PM - hunger and low blood sugar contribute to agitation
  • Avoid scheduling visitors, appointments, or activities during the sundowning window
  • Bright morning light - natural or via a 10,000 lux lamp - to anchor the circadian clock

The role of a consistent caregiver during the risk window

The 3–7 PM window is the most demanding period of the day for families managing dementia at home. It is also the period when family caregivers are often tired themselves - returning from work, preparing dinner, managing household responsibilities.

A caregiver present during this window who knows the person's specific patterns - what calms them, what escalates them, what activities help - provides an intervention that no environmental modification alone can replicate. Familiarity matters: a consistent caregiver the person recognises reduces the anxiety that sundowning amplifies. See our dementia care service for how Aviora matches and retains consistent caregivers.

When sundowning signals a need for more support

Sundowning that causes unsafe situations - exit attempts, falls, aggressive outbursts, or persistent nighttime wakefulness - is beyond what environmental strategies alone can address. Signals that more support is needed include:

  • The person is regularly attempting to leave the home after dark
  • Family caregivers are unable to manage evening agitation safely
  • The person's sleep is so disrupted that they are awake and wandering at 2 or 3 AM
  • Agitation is escalating in severity over consecutive weeks
  • Family caregivers are not sleeping and are approaching burnout

When these signs are present, the conversation shifts from management strategies to whether additional caregiver hours - particularly evening and overnight - are needed. See our guides on when dementia needs 24-hour care and Lewy body dementia home care for related guidance.

Book a free consultationCall +1 (437) 446-7752

Common questions

Sundowning in Ontario: questions families ask

What is sundowning in dementia?

Sundowning is a pattern of late-afternoon and early-evening agitation, confusion, restlessness, or emotional disturbance in people with dementia. It is most common with Alzheimer's disease. The underlying cause involves disruption of the circadian rhythm, cumulative daytime fatigue, and reduced capacity to process sensory input as the day progresses.

Why does sundowning seem worse in Ontario winters?

Ontario winters bring very short days - sunset can be as early as 4:30 PM. Reduced daylight disrupts the circadian clock, which relies on light signals to regulate sleep and wakefulness. Less opportunity for outdoor activity in cold weather also reduces physical fatigue that helps regulate sleep. Light therapy and indoor lighting strategies are particularly relevant for Ontario families through the winter months.

What helps with sundowning in dementia?

Consistent daily routine, morning physical activity, bright morning light, reduced stimulation after 3 PM, a structured afternoon activity, and a nutritious late-afternoon snack. A consistent caregiver present during the 3–7 PM window who knows the person's specific patterns is among the most effective interventions available.

When does sundowning require more home care support?

When sundowning produces unsafe behaviours - exit attempts, falls, severe agitation, nighttime wakefulness - or when family caregivers can no longer manage the evening window safely. Additional caregiver hours in the late afternoon and evening, or overnight support, are appropriate when these signals are present.

Dementia care across Ontario

Aviora dementia care and related services

Consistent caregivers, province-wide - from Toronto and Ottawa to Kitchener, Hamilton, and rural Ontario.

Dementia Care

Consistent matched caregivers trained in dementia behaviour support - including sundowning and wandering.

24-Hour Care

Around-the-clock supervision for people with severe or overnight sundowning patterns.

Live-In Care

A dedicated live-in caregiver provides continuous presence through high-risk evening and overnight hours.

Companionship Care

Structured engagement and activity during the late-afternoon risk window that reduces restlessness.

Respite & Overnight

Family caregiver relief - scheduled overnight or afternoon shifts during the most demanding hours.

Wandering Safety Guide

Environmental changes, monitoring tools, and MedicAlert registration for Ontario families.

Serving Toronto, Kitchener, Ottawa, Hamilton, London, and 120+ communities across Ontario.

Book a Free ConsultationAll Services