Sundowning and Difficult Nights: What to Rule Out Before You Manage It

Sundowning is a description, not a diagnosis. It names agitation, restlessness and worsened confusion that appear in the late afternoon and evening, and it explains nothing about why. The first job is therefore not to manage it but to rule out the treatable things that produce exactly the same picture at exactly the same time of day. Families are usually handed the word and nothing else, and the word is the problem: once a pattern has a name, it stops being investigated.

The list of things that produce a bad late afternoon is short, boring and largely fixable. The one at the top of it, and the one that gets missed most often, is delirium.

On what I can and cannot claim here: my mother does not have dementia, and I have never sat through a sundowning evening in my own house. What I have watched from close range is two days of post-operative confusion after her coronary bypass surgery in April 2022 that I had no word for, which taught me only how easy it is to accept a change without questioning it. The rest of this page comes from the guidance and from four years of a carers’ group and a forum in which “the evenings” is the subject that generates the most exhausted posting of any. Where a beat is somebody else’s, I have said so.

This article sits under caring for a parent at home and belongs with dementia care at home.

What does the word actually mean, and what does it not?

It means a time pattern. Some people with dementia become more anxious, more restless, more confused, more resistant or more tearful as the light goes, and settle again later or overnight. That is the whole of the observation.

What it does not mean is that the pattern is inevitable, that it is untreatable, or that it explains itself. It does not name a mechanism, it does not appear as a diagnosis, and it is not a reason to stop asking questions. Treat it the way you would treat “she is off her food”: a description that starts an investigation rather than concludes one.

The reason this matters so much is timing. Delirium fluctuates, and it is characteristically worse in the late afternoon and at night. So does sundowning, by definition. The two look identical at five o’clock on a Tuesday, and only one of them is often reversible.

How do you tell it from delirium?

By speed and by newness, which is the same test that runs through every clinical page on this site. A pattern that has been part of the household for months, at roughly the same time each day, at roughly the same intensity, is the thing the word sundowning describes. A pattern that arrived this week, or that is markedly worse than last week, is delirium until somebody says otherwise.

Three questions do most of the sorting. When did this start? Days means delirium; months means the other thing. Is it worse than it was seven days ago? A step change is a change, not a stage. Can they hold attention on a sentence or a simple instruction? Attention is the faculty delirium hits hardest and the one dementia leaves relatively intact until late.

You are not being asked to decide. You are being asked to notice, to date it, and to ring, because you are the only person in the whole system who knows what they were like last Tuesday. Spotting when someone is getting worse sets out the baseline-versus-change method in full, and delirium or dementia covers the distinction itself.

What has to be ruled out first?

This is the payload of the page, and it is a checklist rather than a theory. Work down it before accepting any explanation that begins “it is just the dementia”.

1. Delirium, first and always. NICE describes delirium as a clinical syndrome characterised by disturbed consciousness, cognitive function or perception, with an acute onset and a fluctuating course, usually developing over 1 to 2 days, and states in the same breath that “it can be prevented and treated if dealt with urgently”¹. It also concedes the difficulty: “It can be difficult to distinguish between delirium and dementia and some people may have both conditions.”¹ The instruction that resolves it is verbatim: “If there is difficulty distinguishing between the diagnoses of delirium, dementia or delirium superimposed on dementia, manage the delirium first.”¹ This is common: prevalence is about 20 to 30 percent among people on medical wards, 10 to 50 percent of people having surgery develop it, and it runs under 20 percent in long-term care¹, with up to 50 percent among people who have had a hip fracture and up to 75 percent in intensive care (SIGN 157, published March 2019, revalidated 2022, Scotland)². It is also badly under-recorded: NICE notes that “reporting of delirium is poor in the UK, indicating that awareness and reporting procedures need to be improved”¹. Delirium or dementia sets out the distinction in full.

2. Pain. In somebody who cannot say what hurts, pain presents as agitation, resistance to being moved, or restlessness that builds through the day as analgesia wears thin and tiredness reduces tolerance. Arthritis, a healing fracture, an ulcer, a sore mouth, an ingrown toenail. New or worsening pain in a person who cannot report it is a same-day call in its own right.

3. Constipation. Uncomfortable, extremely common in this group, easily missed because nobody is tracking it, and a reliable producer of restlessness and distress. It is worth somebody knowing when the bowels last opened.

4. Urinary retention and urinary infection. Both produce agitation and confusion, both are treatable, and both are frequently found only when somebody thinks to look. A sudden change in continence is a medical sign rather than a laundry problem: see continence and keeping dignity.

5. Hunger, thirst and low intake. Late afternoon is a long way from lunch. Dehydration and low intake worsen confusion directly, and unintended weight loss is a warning sign rather than a fact of age: eating, drinking and weight loss covers the targets and when to ask for a referral.

6. Medicines. A new medicine, a changed dose, or a list that has accumulated quietly over ten years are all candidates, and this is the point at which to ask for a review rather than to make a change. NICE guideline NG5 recommends considering a structured medication review for people taking multiple medicines, people with long-term conditions and older people³, and says the review takes into account the person’s and the carers’ views and concerns, all prescribed, over-the-counter and complementary medicines and what they are for, safety, effectiveness and appropriateness, risk factors for adverse drug reactions, and the monitoring needed³. No page on this site gives a dose, a dose change, or an instruction to give or withhold anything. That belongs to the prescriber and the pharmacist, who can see the whole list. Managing someone else’s medication covers how to ask.

7. Hearing and vision. Hearing aids without batteries and glasses left in another room turn a dim evening into a frightening one. This is the cheapest item on the list and it is skipped constantly.

8. No rest in the day. A person who has been up, prompted, entertained and taken out since seven in the morning is running on empty by four, and so is the person doing the prompting.

If any of the first six is new this week, that is a phone call today, not an adjustment to the evening routine.

Which contributors can you actually change?

The environmental ones, and they matter more than they sound because they work every day without anybody having to remember a technique.

• Light. Put the lights on before the afternoon starts to fade rather than after, so the transition is gradual instead of abrupt. Close curtains before dusk so the windows stop becoming black mirrors, which is a common source of “there is somebody outside”.
• Noise and traffic. Television left running, a radio, a hoover, three conversations, a visitor arriving at half past five. Evening is the wrong time for the busiest hour of the household.
• Handovers. Paid carers arriving, family coming home from work, the shape of the house changing at the exact hour when a person is least able to absorb change. Where the timing is negotiable, negotiate it.
• Decisions. Every open question is a demand on a system that is short of capacity. Offer two options rather than six, and move the choices to the morning.
• The nap. A sleep that runs into the late afternoon buys a difficult evening and a worse night. Earlier and shorter is the trade.
• Caffeine and the timing of the big meal. Both are worth moving earlier, and both are easy to change.
• Where the demanding tasks sit. Bathing, hair washing, nail cutting and anything requiring undressing belong in the morning, not at six in the evening. Almost every carer who has moved these reports it as the single biggest improvement they made.
• Daylight and activity earlier in the day. The most consistently reported lever, and the one that requires the most organisation. Day services and community support covers the versions of this that somebody else runs.

And one that is not about the person at all. Your own tiredness at five o’clock is part of the picture. Agitation runs in both directions, and a carer who is at the end of their reserves at exactly the hour the evening turns is a real and predictable factor. That is an argument for arranging the hard tasks earlier and for handing the five to seven window to somebody else where that is possible, not an accusation.

What helps, and how good is the evidence?

Routine, light and load reduction help, and the honest position is that the trial evidence behind carer-delivered strategies is thinner than the confidence with which they are usually recommended.

NICE guideline NG97 recommends offering carers a psychoeducation and skills training intervention covering education about dementia and its progression, personalised strategies and skill-building, understanding and responding to behaviour change, adapting communication styles, advice on their own physical and mental health, planning enjoyable and meaningful activities, information about relevant services, and planning for the future, and adds, verbatim, “Be aware that carer interventions are likely to be most effective when provided as group sessions”⁴. That is the best-supported route into the practical strategies above, and it is a course rather than a web page.

The wider carer literature is weaker and NICE says so. In guideline NG150, psychosocial and psychoeducational support is worded as “consider” rather than “offer”, because “overall, the quality of the quantitative evidence was low so the committee agreed that psychosocial and psychoeducational support should only be considered as an option for carers rather than be offered routinely”, although “the evidence for group interventions was more convincing than for one-to-one interventions”⁵. Read that as a reason to prefer a group and to lower your expectations of a leaflet, not as a reason to do nothing.

The practical implication is a discipline rather than a technique: change one thing at a time and write down what happened. A dated line saying “moved the bath to 10am on the 12th, three settled evenings out of four since” is worth more to a clinician than any amount of description, and it is the only way to tell an improvement from a good week. Keeping a care file is where that record lives, and being heard in appointments covers getting it into a ten minute slot.

What the nights do to you, and what to do about that

They are the part of dementia caring that empties people fastest, and the damage is measurable. Among carers responding to Carers UK’s survey run between June and August 2025, 65 percent found it hard to get a good night’s sleep, on a self-selecting sample of 10,539 respondents that Carers UK states is not a representative survey, and which was 82 percent female, 90 percent White British and 61 percent caring 50 or more hours a week⁶. Read it as carers who responded rather than as carers in general. The direction is still not seriously in doubt.

Being on call is a state rather than a task, which is why a free night frequently does not produce sleep. Sleeping when you are on call covers the arrangements that genuinely recover some of it, in order of how much they recover. Carer burnout and your own health sets out what sustained caring does to mood, sleep, body and money, and where the popular claims about it overstate the evidence.

If the evening ends with the front door, wandering and keeping someone safe covers the risk assessment, the legal limits on restricting somebody, and what to do in the first hour. If it runs on questions, repeated questions and what to say covers what to say instead of correcting. And if the honest answer is that the nights cannot be sustained by one person, that is a reason to ask rather than to fail quietly: getting help in sets out what exists and how each part of it is triggered.

This is a call today, not a routine to endure until the review

Sundowning that has been stable for months is a conversation to book. A change in it is not. Ring the same day, and say what they were like last week, if the person you look after:

• Has become more confused than they were yesterday, or the confusion comes and goes through the day. Use the word confusion, and the word delirium if you think it applies.
• Has a new or suddenly worse evening pattern, particularly one that started within the last day or two.
• Is agitated and cannot tell you what is wrong, which in somebody without words is how pain, constipation and urinary retention present.
• Has become withdrawn, drowsy, slow to respond, or has stopped finishing meals, which is the quiet form of delirium and the one most often missed¹.
• Has a new fever, has stopped drinking, has not passed urine, or has a sudden change in continence.
• Has had any new or changed medicine, a recent hospital stay or an anaesthetic, all of which raise the risk sharply¹.
• Has fallen, or has been found on the floor.

Who to ring: in the United Kingdom, their GP surgery, or NHS 111 out of hours. In Ireland, their GP or the out of hours GP service. In the United States, their own doctor’s office, or the nurse line their plan runs, or an urgent care center. In Australia, their GP, or healthdirect on 1800 022 222. In Canada, their family doctor or the provincial health line, 811 in most provinces.

Use the emergency number immediately for changed breathing, chest pain, one-sided weakness, changed speech, a first seizure, an unrousable person, or bleeding that will not stop: 999 or 112 in the United Kingdom and Ireland, 911 in the United States and Canada, 000 in Australia, 112 across the European Union.

The most expensive sentence in this subject is “the evenings are always like that”. Sometimes they are. The point of the checklist is that for a good proportion of families, on a good proportion of weeks, they are not.