What Stage of Dementia Is Sundowning Most Common, and What Can You Do About It?

It starts around four o’clock. You could set a watch by it. The kitchen light goes flat and orange, and your mother, who has been steady all afternoon, stands up and starts hunting for her keys.

She has her coat on. She needs to get home, she says. You tell her that she’s home, and she looks at you the way you’d look at a stranger giving directions to a town you’ve never heard of.

By seven she’s pacing. By nine you’re both worn out, standing in the hallway and wondering what you did differently today. Nothing. You did nothing wrong. I take more calls about the four o’clock hour than about almost anything else families face at home. Every one of them starts with someone apologizing for not handling it better.

What stage of dementia is sundowning most common in?

Sundowning is most common in the middle stage of dementia, and it often continues into the later stages. It can appear at any point, and some families notice a hint of it early. The middle years are when it becomes the shape of the evening.

The Alzheimer’s Society puts it plainly: sundowning can happen at any stage, but it’s more common in the middle and later stages. Researchers have found the same pattern, and one detail families always recognize. The unsettled hours usually begin in the early afternoon and peak between four and five. It’s the disease meeting the end of the day.

I won’t pretend anyone can tell you how common it is. The estimates run from a few percent to most people with dementia, because nobody has agreed where ordinary evening tiredness ends and sundowning begins. That gap tells you something useful. The people who study this for a living can’t draw a clean line either. So you can stop grading yourself on how well you spot one.

What does sundowning look like at home?

The clinical description is confusion that grows from dusk into the night, with trouble sleeping, anxiety, agitation, pacing, sometimes hallucinations. That’s accurate. Here’s what I actually hear across the kitchen table.

One daughter told me her mother had started setting the table for four every evening at five, for children who are now in their fifties. She wasn’t confused about the year. She could have told you all four of their ages if you asked. She was following an old instruction her body still remembered, at the hour it had always come. There’s a tenderness in that which the word “agitation” completely misses.

The patterns repeat, family to family:

• She wants to go home while she’s already home. Sometimes home means her childhood house, not this one.
• He follows you from room to room and can’t settle anywhere, including the chair he has sat in for thirty years.
• Bags get packed and drawers get emptied. Coats come on and off for an hour at a time.
• The words get sharper than they used to be, and they tend to land on whoever is doing the most.
• She sees someone in the hallway who isn’t there, or hears a child crying in another room.
• Night and day quietly trade places, so the house is awake at three and asleep at eleven.

None of that is willful. A person who is sundowning isn’t choosing the worst hour of your day to be difficult.

Why does it happen at the same time every day?

Nobody can hand you one clean cause. I wish I could give you one. What the research points to instead is a body clock that has lost its footing.

Deep in the brain sits the suprachiasmatic nucleus, a small cluster of cells that keeps the sleep and wake cycle running on time. Dementia damages it, and melatonin production falls away with it. So the internal signal that should say evening is coming, wind down arrives garbled. Some days it doesn’t arrive at all.

Then the day itself piles on. The Alzheimer’s Society lists the usual suspects: tiredness, hunger, pain, too little daylight, too much stimulation earlier on, and indoor lighting that throws confusing shadows across a wall. A mirror at dusk becomes a stranger in the room. A television left murmuring in the corner becomes a conversation happening somewhere else in the house.

Add the plain weight of holding it together all day. Concentration is finite for every one of us. By late afternoon your parent has spent the whole reserve on tasks that used to be automatic, with nothing left to steady themselves with.

That’s not defiance. By evening she’s simply used up everything she had.

What helps when the light starts to change?

Start with what a hard evening is trying to tell you. It’s usually trying to tell you something. Before you manage the behavior, check the body. Is she hungry? Does she need the bathroom? Is she in pain, too warm, or listening to a hearing aid that has started to whistle? A surprising share of four o’clock storms turn out to be a plain physical need that couldn’t find the words for itself.

Then shape the day around the hour you know is coming. The National Institute on Aging keeps a short list, and it holds up in real houses:

• Keep the schedule steady, so that meals, bathing and bed happen at the same times each day.
• Get real daylight into the morning, outside if you can manage it and by a bright window if you can’t.
• Keep the body moving, without stacking the calendar so full that it wears her out by three.
• Move caffeine and alcohol to the first half of the day, and then stop.
• Discourage the long late nap, because it borrows from the night you both need.

The evening itself wants to get simpler, not busier. Close the curtains before the light goes strange. Turn the lamps on before the shadows arrive, not after. Cover a mirror that has started to frighten her, and turn the television off. Keep the room to one calm voice and one familiar task. Save the visits, the phone calls and the shower for earlier in the day, when she has more to give.

Whatever you do, don’t argue with the version of reality she’s in. I’ve never once seen a calendar and a correction win that argument. If she needs to go home, walk her to the window and ask her what home smelled like. More often than not, the two of you end up somewhere gentler within a few minutes. You aren’t lying to her when you do that. You’re meeting her where she’s standing.

In practice this is smaller than it sounds. Lamps on at three thirty rather than five. Curtains drawn while it’s still light enough that nothing changes visibly in the room. Dinner earlier, while she still has an appetite for it. One person in the kitchen instead of three. None of that ends sundowning, and I wouldn’t tell you otherwise. It does take the worst edge off an evening, which on a hard week is the difference between coping and not.

One more thing, because families ask it constantly. Medication isn’t the first move. The light, the routine and the unmet-need checks come first, and they are what specialists reach for before a prescription. A sudden change still deserves a doctor. New agitation that arrives over days rather than months can be a urinary tract infection, uncontrolled pain, or a medication that no longer suits her.

Does sundowning mean it’s time for memory care?

Not on its own. I’ve watched plenty of families hold sundowning at home for a long stretch. Good light, a steady routine and help that shows up before dark carry you a long way.

The questions that matter are quieter than the ones people ask out loud:

• Is she safe at two in the morning, in a house where everyone else is asleep?
• Are the doors, the stove and the stairs safe for someone who is awake and unsettled at night?
• Are you sleeping? Not resting. Sleeping.
• Is there a second person in this plan, or is the whole thing balanced on you?

Your own exhaustion isn’t a side issue here. I’d rather say that plainly than have you find it out the hard way. Nearly six in ten dementia caregivers report high or very high emotional stress, on the Alzheimer’s Association’s 2026 figures. Sleep loss is one of the fastest routes into that number. A plan that only works if you never sleep isn’t a plan yet.

If you’re weighing what comes next, start with our guide to choosing memory care for a parent in Maryland. It walks through the comparisons and the questions worth asking. If you’re earlier than that, still wondering whether you’ve reached the line at all, read how to know when it’s time for memory care. It was written for exactly that week. Families who are unsure which level of care fits usually start with assisted living compared with memory care. The difference between them is mostly about nights, structure and training.

And if the honest answer is that you can’t face another month of broken nights, a short respite stay is a real option. It isn’t a decision about forever. It’s two weeks of sleep. Sleep tends to make every other decision clearer.

Sundowning doesn’t have to run the house

I’ve sat with so many families in the middle of this. Usually in the week when the evenings had finally beaten them, and nobody had said so out loud yet. Almost every one of them apologized to me for being tired. Not one of them ever needed to.

Here’s what I want you to hear, because nobody says it early enough. This stretch responds to small things. Not to heroics, and not to getting it perfect. To light, an earlier dinner, one calm person in the room instead of three. Families who put those in place tell me the same thing, in almost the same words: the sundowning didn’t vanish, but the four o’clock hour stopped running the house. That is a real difference, and it is the one that is actually available to you.

We’ve walked so many families in Anne Arundel County through exactly this, and we’re glad to talk it through with you whether or not you ever move your parent anywhere. If it would help to see how an evening is handled somewhere with a team awake all night, come and look at one of our memory care communities. Ask what four o’clock looks like here. Ask who is awake at two in the morning, and how often they check. Ask what we do on the night somebody wants to go home.

Our communities are small on purpose. The team knows every resident by name and by habit, and that’s what makes a hard evening manageable, for your parent and for you. That’s not a selling point. It’s the whole reason we do it this way.

There are still good evenings ahead for the two of you. I’ve watched families find them, long after they were sure the good ones were behind them, and I’d like that for you.