WHY IT ALWAYS HAPPENS AT THE SAME TIME
Every person has a circadian rhythm — an internal clock that governs when we sleep, when we wake, and how alert we feel throughout the day. In a healthy brain, that clock stays stable. In a brain affected by dementia, it becomes fragmented, unpredictable, and unreliable.
Now layer in what happens naturally across any given day: fatigue accumulates, and the brain continuously processes sensory input — every sound, every conversation, every visual stimulus. By late afternoon, two things collide at once. The circadian rhythm is at its most unstable. The brain is at its most depleted.
That intersection is what I call the Vulnerability Zone. It happens at roughly the same time every day because the biology is the same every day. The brain simply cannot hold things together past that point — and what you see is sundowning.
THE ROLE OF LIGHT
This one surprises most families. Light is not a minor factor in sundowning — it is one of the primary environmental catalysts.
Before artificial lighting existed, the human body had one circadian regulator: the sun. It came up, it went down, the body followed. A healthy brain can compensate for the disruption that screens and indoor lighting create. A brain with dementia cannot.
When daylight fades and shadows begin forming in the room, your loved one is not simply seeing a dimmer space. They may be seeing confusion and threat. Shadows on the wall can look like people. A reflection in a dark window can look like a stranger standing in the room. This is not imagination — it is a misfiring brain under conditions it can no longer process. And it directly triggers the fear and agitation you see every evening.
WHAT ELSE IS MAKING IT WORSE
Before you assume it is purely the disease progressing, look for secondary triggers. The most common ones I see:
- Medications — certain medications interfere with sleep or destabilize mood. Caffeine late in the day is also a significant disruptor for someone living with dementia — far more than it would be for you or me.
- Hidden physical discomfort — pain, hunger, needing the bathroom. A person who cannot clearly articulate what they are feeling will often express it through behavior.
- Psychological factors — underlying anxiety or depression that intensifies in the evening hours.
- Changes in routine — moving to a new room, a new facility, or even a shift in the household schedule can spike nighttime disorientation immediately.
- Staffing transitions — when a familiar caregiver is replaced by someone new, that change alone can be enough to trigger an episode.
Before adjusting medications or escalating care, ask: what changed?
WHAT YOU CAN DO TODAY
There are two categories of intervention: environmental and rhythmic. Used together, consistently, they can significantly reduce or eliminate sundowning without medication. The key word is consistently. This is not a one-week fix. Give it 30 to 60 days before you evaluate results.
Environmental Interventions
The first thing I tell every caregiver: walk your loved one's room at dusk and look for shadows. Any shadow that forms — in a corner, on the wall, under furniture — is a potential trigger. Eliminate them.
- Lighting — use soft, even lighting throughout the room at night. No dark corners. No harsh contrasts.
- Windows and mirrors — close the curtains before it gets dark. Cover mirrors at night. Reflections after dark are deeply disorienting and can register as strangers in the room.
- Atmosphere — bring in familiar objects, a favorite scent, soft music. The brain anchors to the familiar when everything else feels uncertain.
- Sound — minimize background noise. No loud TV, no competing conversations. Sensory overload accelerates the Vulnerability Zone.
Routine and Rhythm
- Every morning, open the blinds at the same time. Natural sunlight is the single most powerful circadian rhythm reset available to you. Use it.
- Encourage physical activity and time outside during the day — this anchors energy levels and helps the body wind down naturally by evening.
- Build a wind-down sequence and repeat it every single night without deviation. Same time. Same room. Soft music on a timer. Lights dimmed. Curtains closed. Quiet. When the brain starts anticipating that sequence, the circadian rhythm begins to stabilize.
When you call the doctor, the reflex is often to prescribe a sleeping pill. But if you build this framework and give it 60 days of consistency, you may not need one. That is not optimism — that is what the data supports. And it is what we teach caregivers inside the GUIDE Model every day.
The Invisible Weight: Caregiver Exhaustion
Managing sundowning every single evening — bracing for it, talking someone down from it, resetting after it — wears you down in a way that is hard to describe to someone who has not lived it. Many caregivers I speak to are running on empty by 6 PM.
You should not have to do this alone. And thanks to a new Medicare program, you don't have to.
The GUIDE Model: Medicare's New Dementia Care Program
MedBetter Health is proud to participate in Medicare's GUIDE Model — Guiding an Improved Dementia Experience. This 8-year CMS initiative is transforming dementia care nationwide.
Through the program, eligible beneficiaries and their caregivers receive:
- A dedicated Care Navigator who is available during business hours and coordinates all aspects of care
- A 24/7 helpline for non-medical behavioral emergencies — for when you don't know what to do at 2am
- Medicare-covered respite care so you can take a real break while someone qualified stays with your loved one
- Caregiver education, training, and personalized dementia care plans
👉 Check your eligibility for the GUIDE Model Program in under two minutes: https://medbetterhealth.org/guide
Even if you are not eligible for the GUIDE Model, MedBetter Health remains committed to supporting every caregiver with practical, evidence-based education.
Straight Talk With Dr. Erik
Learn more about sundowning in dementia. Watch the full video and subscribe for regular insights.
https://www.youtube.com/@ErikIlyayev
Thank you for reading The Dementia Times.
With gratitude,
Dr. Erik Ilyayev, MD
CEO, MedBetter Health