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Dog Dementia Worse at Night? How to Help a Senior Dog Who Sundowns

By Wes & Murray Updated 9 min read

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If your old dog has started wandering the house at 3am, staring at walls, or barking at nothing once the lights go off, you're not imagining it, and you're not alone. Night is often the hardest time for a dog with dementia. The house is dark and quiet, the usual cues are gone, and a confused brain has less to hold onto. This guide covers what's going on and the specific things that make nights calmer, for your dog and for you.

What Is Sundowning in Dogs?

"Sundowning" is the name owners and vets borrow from human dementia care for confusion and agitation that gets worse in the late afternoon, evening, and night. In dogs, it's usually part of canine cognitive dysfunction (CCD), an age-related decline in brain function, often called dog dementia.

Vets group the signs of CCD under the letters DISHAA:

  • Disorientation: getting lost in familiar rooms, waiting at the hinge side of a door, staring into corners
  • Interaction changes: less interest in the family, or suddenly much more clingy
  • Sleep-wake changes: sleeping much of the day and awake at night
  • House soiling: accidents from a dog who was reliably house-trained
  • Activity changes: aimless pacing or circling, or much less play
  • Anxiety: new fears, restlessness, whining or barking, especially at night

The sleep-wake change is often one of the first things owners notice. You can print the DISHAA checklist from the Morris Animal Foundation, fill it in over a week, and bring it to your vet.

Why Is My Dog's Dementia Worse at Night?

A few things pile up after dark:

  • Fewer cues. In the day there's light, noise, and people moving around. At night those landmarks disappear, and a dog who's already struggling to keep track of where they are loses their bearings.
  • A scrambled body clock. Dogs with CCD often doze through the day, so they simply aren't tired at bedtime.
  • Poorer eyesight in the dark. Many older dogs see less well at night, which adds to the confusion.
  • Pain and other problems. Arthritis, needing to pee, and other illness tend to show up more when the house is still. These can look exactly like dementia.

That last point matters most. Before you put night wandering down to dementia, see your vet. CCD is diagnosed by ruling other things out, and pain in particular is easy to miss in an older dog and very treatable. See our guide on why old dogs get restless at night for the full list of causes.

How Common Is Dementia in Older Dogs?

More common than most people think. Research estimates that around 28% of dogs aged 11–12 and 68% of dogs aged 15–16 show signs of cognitive dysfunction. One survey of nearly 500 older dogs found that only a small fraction of affected dogs had ever been diagnosed by a vet. Owners often assume the changes are just old age.

What Helps at Night: A Practical Plan

None of these is a cure, but together they often take the edge off. Try a few at a time and keep notes on what changes.

Make the day busier and brighter

A dog who sleeps all day won't sleep all night.

  • Get outside in daylight, ideally in the morning. Natural light helps set the body clock.
  • Give your dog short, gentle things to do through the day: a slow sniff walk, a food puzzle, a couple of old tricks they still know.
  • Gently wake a dog who's dozing for hours in the late afternoon and do something low-key together.

The goal is a calm, engaged day, not an exhausted dog.

Keep the evening exactly the same

Dogs with dementia lean hard on routine. Feed dinner, take the evening walk, and go to bed at the same times every day, in the same order. A predictable wind-down tells a confused brain what's coming next.

Add soft light where your dog moves at night

Plug-in night lights along the hallway, near the water bowl, and by the dog bed help a dog with poor night vision get their bearings without waking the house. Dusk-to-dawn lights switch themselves on, so you don't have to remember.

GE dusk-to-dawn night lights on Amazon →

If your dog uses a ramp at night, a strip of glow-in-the-dark tape along its edges makes it easier to find.

Make the space safe for wandering

A dog who wanders at night can get stuck behind furniture, fall down stairs, or end up somewhere they can't get out of.

  • Gate off stairs and any rooms where your dog tends to get trapped.
  • Keep furniture where it is. Moving things around makes it harder for a confused dog to find their way.
  • Put rugs or runners on slick floors so they don't slip.
  • Consider a small, padded area with their bed, water, and a pee pad, using a pen or gates, so they can wander a little without getting lost.

Plan for night accidents

House-soiling is part of CCD. Don't scold; your dog isn't doing it on purpose. Take them out right before you go to bed, and use washable waterproof pads under their bedding so cleanup is quick. Our accident-proof bedding guide walks through the setup.

Reusable waterproof bed pads on Amazon →

Let them sleep near you

Many older dogs settle better when they can smell and hear their people. If your dog sleeps in another room, try moving their bed into your bedroom for a few weeks.

Treat the pain, too

Arthritis and other pain make confusion and restlessness worse. If your dog is stiff, slow to get up, or keeps shifting positions, mention it to your vet. A thick orthopedic bed helps sore joints, but it's not a substitute for proper pain relief.

What Your Vet Can Offer

Once other causes are ruled out, your vet has several options:

  • Selegiline (brand name Anipryl). This is the only FDA-approved prescription medicine for canine cognitive dysfunction. Most dogs that respond show some improvement after about a month, and it can keep improving for up to 12 weeks. It can interact with some other drugs, including certain anxiety medicines, so your vet will check what your dog already takes.
  • Diets designed for brain aging. There are prescription and over-the-counter senior diets formulated to support cognitive health. Ask your vet whether one fits your dog.
  • Supplements. Omega-3 fatty acids and some other supplements may support brain health. Check with your vet first, because supplements aren't regulated like medicines and can interact with prescriptions.
  • Help with sleep or anxiety. Your vet may suggest melatonin or another medication to help your dog sleep through the night.

A warning about melatonin: many human melatonin gummies and quick-dissolve tablets contain xylitol, which is very toxic to dogs. Never give your dog a human sleep aid unless your vet has approved the specific product and dose.

Look After Yourself, Too

Months of broken sleep are hard. If you're exhausted:

  • Take turns on "night duty" with someone else in the house.
  • Use a baby monitor or pet camera, so you can check on your dog without getting up each time.
  • Tell your vet how much sleep you're losing. It's useful information, and it can change what they recommend.

When nights get very difficult despite treatment, it's okay to talk to your vet about your dog's quality of life. That conversation doesn't commit you to anything, and many vets are glad to help you think it through.

When to Call the Vet Right Away

  • Sudden confusion, falling over, head tilt, or circling that came on over hours or a day
  • A seizure
  • Your dog can't stand or seems to be in obvious pain
  • Panting hard at rest with a swollen belly or retching without bringing anything up

These need a vet the same day, or an emergency clinic at night.

Frequently Asked Questions

Why is my dog's dementia worse at night?

At night there are fewer cues like light, sound, and people moving around, so a dog with cognitive dysfunction loses their bearings more easily. Many also nap through the day and aren't tired at bedtime. Pain and needing to pee can add to it, so ask your vet to check for those too.

What is sundowning in dogs?

Sundowning is confusion, pacing, and agitation that gets worse in the evening and at night. In dogs it's usually a sign of canine cognitive dysfunction, the dog version of dementia.

How can I help my dog with dementia sleep at night?

Keep your dog active and outside in daylight, stick to a fixed evening routine, add night lights, gate off stairs, take them out right before bed, and let them sleep near you. If that's not enough, ask your vet about medication, diet, or a sleep aid that's safe for dogs.

Can I give my dog with dementia melatonin?

Only with your vet's approval. Vets sometimes use melatonin for older dogs who can't sleep, but many human melatonin products contain xylitol, which is toxic to dogs. Your vet can recommend a safe product and dose.

Is there medicine for dog dementia?

Yes. Selegiline (Anipryl) is the only FDA-approved medication for canine cognitive dysfunction in dogs. It usually takes about a month to see a difference. Your vet may also suggest a special diet, supplements, or medicine for anxiety or sleep.

How do I know if my old dog has dementia?

Look for the DISHAA signs: disorientation, changes in how your dog interacts with you, a flipped sleep schedule, house-training accidents, aimless pacing or less activity, and new anxiety. If you see several, tell your vet. They'll rule out other causes first.

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