Sundowning in Dementia: Why 4PM Feels Like a Completely Different Person
It is not random. It is not your imagination. And there are things that actually help.
If you have noticed that your parent or loved one with dementia seems to get significantly worse in the late afternoon and evening — more confused, more agitated, more unlike themselves — you are not imagining it. There is a name for it. It is called sundowning, and it is one of the most exhausting and least talked-about parts of dementia caregiving.
What Is Sundowning?
Sundowning — also called late-day confusion or sundown syndrome — refers to a pattern of increased confusion, agitation, anxiety, and behavioral changes that occur in the late afternoon and evening hours in people with dementia.
It does not happen to everyone with dementia, but it is common enough that most caregivers will encounter it at some point. And when it starts, it can feel like a completely different person has taken over the body of the person you know.
Increased confusion and disorientation. Agitation or restlessness that comes on suddenly. Pacing, wandering, or wanting to “go home” even when they are home. Suspicion or accusations. Emotional outbursts that seem to come from nowhere. Refusing care they accepted earlier in the day.
What Causes Sundowning?
Researchers do not fully understand why sundowning happens, but several factors are believed to contribute.
Disrupted Circadian Rhythm
Dementia damages the part of the brain that regulates the body’s internal clock. As the disease progresses, the brain loses its ability to distinguish between day and night — which is why late afternoon and evening can trigger such a dramatic shift in behavior.
Fatigue
By late afternoon, someone with dementia has often been working very hard all day just to process the world around them. Mental exhaustion compounds confusion. The brain that was managing reasonably well at 10am simply runs out of capacity by 4pm.
Low Light
As natural light fades, shadows increase and visual perception becomes harder. For someone already struggling with brain processing, the shift from bright to dim light can dramatically increase disorientation.
Caregiver Fatigue
This one is harder to talk about — but caregivers are also more tired by late afternoon. Tension, impatience, and stress are picked up by people with dementia even when they cannot process language well. The emotional environment of the room affects them more than most people realize.
What Actually Helps
There is no cure for sundowning. But there are strategies that consistently help caregivers get through the hardest hours of the day.
Maximize Morning Light
Bright light exposure in the morning helps regulate the circadian rhythm. Open curtains early. Sit near a window. Some families use a light therapy box in the morning hours with good results — ask the physician before starting.
Protect the Afternoon Schedule
Avoid scheduling demanding activities, appointments, or tasks in the late afternoon. Keep that window as calm and predictable as possible. Familiar, low-stimulation activity — a favorite music playlist, a simple task with their hands, a quiet walk — can reduce the window of agitation.
Watch for Triggers
Hunger, pain, needing to use the bathroom, and overstimulation can all accelerate sundowning. A late afternoon snack, a bathroom trip, and reducing background noise (TV off, fewer people in the room) can make a measurable difference.
Do Not Argue With the Reality They Are In
When sundowning hits and they insist they need to go home, or ask for someone who has passed away, or accuse you of something that did not happen — arguing will make it worse. Meet them where they are. Redirect gently. The goal is not to correct them. The goal is to lower the anxiety in the room.
You cannot logic someone out of sundowning. You can only make the environment around them feel safer. That is enough. That is the job.
Keep Evenings Dim and Calm — but Not Dark
Darkness increases disorientation. Keep rooms softly lit in the evening rather than switching abruptly from bright lights to dark. Night lights in hallways and bathrooms reduce nighttime wandering risk significantly.
Talk to the Physician About Medication
If sundowning is severe — if there is significant agitation, aggression, or sleep disruption that is affecting safety — medication options exist and are worth a conversation with the physician. Do not wait until there is a crisis to raise it.
When sundowning hits and they want to “go home” or ask about someone who has passed — knowing what to say makes all the difference. This free guide gives you five word-for-word scripts for the conversations dementia caregivers dread most.
Download Free Scripts Ready for the full guide? The Dementia Caregiver’s Handbook — $27 →When Sundowning Gets Worse
Sundowning often becomes more intense as dementia progresses. If you notice it is getting significantly worse — more frequent, more severe, harder to redirect — that is important information for the physician and worth documenting.
It can also be a sign that something else is going on: a urinary tract infection, pain the person cannot communicate, a medication side effect, or a change in the progression of the disease. Any sudden or significant worsening warrants a call to the doctor.
What No One Tells Caregivers About Sundowning
The hardest part of sundowning is not the behavior itself. It is that it happens every single day, at the same time, and you cannot stop it from coming. You can only prepare for it.
Caregivers who do best with sundowning are the ones who stop trying to prevent it and start building a plan for moving through it. A playlist ready. A snack prepared. The lights adjusted. A phrase or two that tends to work. And permission to step outside for three minutes if you need to.
You are not failing when sundowning happens. You are caregiving in one of the hardest moments the disease creates. Getting through it is enough.
Sundowning is one chapter of a very long journey. The Handbook covers what to expect at every stage, how to make decisions you will not regret, how to talk to doctors, and how to take care of yourself while you take care of them.
Get the Handbook — $27Frequently Asked Questions
Sundowning typically begins in the late afternoon, often between 3pm and 5pm, and can extend into the evening. The timing varies by person and may shift as dementia progresses.
For many people with dementia, sundowning follows a fairly consistent daily pattern. Some days are better than others, and triggers like illness, schedule changes, or fatigue can make it worse.
Sundowning can occur at various stages of dementia, but it often becomes more intense as the disease progresses. A sudden significant change in sundowning behavior is worth reporting to the physician, as it can sometimes indicate an infection or other treatable condition.
Do not argue or try to explain that they are already home. Instead, acknowledge the feeling: “Tell me about home — what do you miss about it?” or gently redirect with a familiar activity or a walk. The goal is to lower anxiety, not to correct them.
In some cases, yes. If sundowning involves significant agitation, aggression, or sleep disruption that is affecting safety, a physician may recommend medication. This is a conversation worth having — do not wait for a crisis to raise it.
Sundowning can shift over time as dementia progresses. Some caregivers find it improves in later stages; others find it worsens. Managing the environment, routine, and triggers remains the most consistent approach at every stage.