Alzheimer's Nighttime Wandering: Detection Without a Camera

The 2 AM Fear

If you're caring for someone with Alzheimer's or another form of dementia, you know the fear. It's 2 AM and the house is quiet, but you can't fully sleep because you're listening. Listening for footsteps. Listening for the front door. Listening for silence that's too silent.

Nighttime wandering affects an estimated 60% of people with Alzheimer's disease at some point during the progression. It's one of the most dangerous behavioral symptoms of the disease, and one of the primary reasons families move a loved one to a care facility — not because they can't handle the daytime care, but because they can't survive on no sleep indefinitely.

What Is Sundowning?

Sundowning refers to a pattern of increased confusion, agitation, and restlessness that occurs in the late afternoon and evening in people with dementia. It's not fully understood, but it's likely related to disruption of the circadian rhythm — the same biological clock that regulates sleep-wake cycles in healthy people.

In Alzheimer's patients, the suprachiasmatic nucleus (the brain's master clock) degenerates. This leads to fragmented sleep, reversed day-night cycles, and a tendency toward nighttime agitation. The person may not understand where they are, may try to "go home" (even when they are home), or may simply get up and walk.

The wandering itself is dangerous. Falls are the immediate concern — hip fractures in elderly dementia patients have a mortality rate that should make everyone uncomfortable. But there's also the risk of leaving the house, exposure to weather, traffic, and simply getting lost.

The Current Solutions (And Their Problems)

Families and care facilities have been dealing with nighttime wandering for decades. The tools available are surprisingly crude.

Door and Window Alarms

Simple magnetic sensors that chirp when a door opens. Cheap, easy to install, and they work — after the person has already gotten up, walked to the door, and opened it. By the time you hear the alarm and get out of bed, they may already be outside. In a facility, the response time between alarm and staff arrival can be several minutes.

Door alarms also produce false positives. Other family members opening doors, pets, HVAC drafts — all can trigger alerts that erode trust in the system. Alert fatigue is a real problem. After the twentieth false alarm, people start ignoring them.

Bed Alarms (Pressure Mats)

A pressure-sensitive pad placed on the bed that alarms when the person stands up. These detect the moment of bed exit, which is earlier than a door alarm. But they have significant drawbacks:

Comfort. Many patients can feel the pad and find it uncomfortable or confusing. Some will pull it out.

False alarms. Rolling to the edge of the bed, sitting up without getting out, or shifting weight can trigger the alarm. In care facilities, pressure mat false alarm rates as high as 80-90% have been documented. Nursing staff begin ignoring them, which defeats the purpose.

No intelligence. The pad knows weight is on it or weight is not. It can't distinguish between someone sitting up briefly and someone actively leaving the bed to wander. Every trigger gets the same alarm.

Cameras

Video monitoring is the most comprehensive solution. You can see exactly what's happening in real time. Some systems include motion detection and can send alerts to a phone.

They work. But there's a cost that isn't measured in dollars.

Nobody wants a camera pointed at their bed. Not your parent. Not your spouse. Not you. The person being monitored is still a human being with a right to dignity, even when their cognition has declined. They may not be able to articulate their discomfort with being watched, but that doesn't mean the discomfort doesn't exist.

In a study published in the Journal of the American Medical Directors Association, both caregivers and patients expressed significant concerns about privacy when video monitoring was proposed. Caregivers felt guilt. Patients — even those with moderate dementia — expressed resistance and distress.

There's also the practical issue of what you do with the video. Someone has to monitor it. Reviewing footage after the fact doesn't prevent a fall or a wandering episode. Real-time monitoring means someone staring at a screen — which is what we were trying to avoid by using technology in the first place.

What Radar-Based Detection Does Differently

A radar-based presence detection system takes a fundamentally different approach. Instead of monitoring exits (door alarms), pressure (bed mats), or visual activity (cameras), it monitors presence and movement in the room using millimeter-wave radar.

Here's what that means in practice:

Bed exit detection. The system knows when the person is in bed and when they leave. Not because of a pressure pad they can feel, but because radar tracks their position in the room. The moment they stand up, the system registers a bed exit event — and can immediately alert a caregiver's phone or a nursing station.

No camera. No video. No recording of what anyone looks like. Radar sees movement and position. It does not produce images. There is nothing to review, nothing to hack, nothing that feels invasive. The person's dignity is fully preserved.

Works through blankets. Radar penetrates blankets, sheets, and comforters without any degradation. Unlike optical systems that might be blocked by bedding, radar doesn't care what's covering the person.

No wearable required. Nothing on the wrist. Nothing around the neck. Nothing to remove, lose, or forget. The device sits on a nightstand or shelf and monitors passively.

Reduced false alarms. Because radar tracks continuous position rather than binary on/off pressure, it can distinguish between someone sitting up briefly (not a concern) and someone standing and moving away from the bed (a concern). This dramatically reduces false alarms compared to pressure mats.

Dignity Matters Even When Cognition Doesn't

This is the part that doesn't show up in product spec sheets but matters more than any technical feature.

A person with Alzheimer's is still a person. They have a lifetime of identity, preferences, and privacy expectations that don't evaporate with cognitive decline. The fact that they may not be able to articulate their objection to a camera doesn't mean the objection isn't there.

Caregiving is an act of love. And part of loving someone is protecting not just their physical safety but their human dignity. If technology can help keep an eye on someone without stripping away their privacy, that's the technology we should be building.

Komori was designed with this principle from the beginning. No camera watching your loved one sleep. No footage stored anywhere. Just the data that helps you stay aware — presence, position, movement — and nothing more.

It's not a medical alert system — for emergencies, you'll still want dedicated fall detection. But for the daily question of "did Mom get up and not come back to bed?" — this is the missing piece. For a practical comparison of all the alert options available, see our guide to bed exit alerts for elderly parents.

The Caregiver's Sleep Matters Too

There's a dimension to this that gets overlooked: the caregiver's own health.

Alzheimer's caregivers have significantly elevated rates of depression, anxiety, cardiovascular disease, and immune dysfunction compared to non-caregivers. Sleep deprivation is a major driver. When you're waking up three times a night to check on someone — or lying awake because you're afraid to sleep — you are destroying your own health.

Reliable bed exit alerts don't just protect the patient. They give the caregiver permission to sleep. When you trust that the system will wake you if something happens, you can actually close your eyes. That's not a luxury. It's a medical necessity.

A study in Sleep Medicine Reviews found that technological monitoring solutions that reduced nighttime check-ins improved caregiver sleep quality by a clinically significant margin. The caregivers didn't just sleep longer — they slept deeper, because the hypervigilance decreased.

The Bottom Line

Nighttime wandering is one of the hardest challenges in Alzheimer's caregiving. The solutions that exist today mostly work by either sacrificing privacy (cameras) or generating so many false alarms that they're ignored (pressure mats and door sensors).

Radar-based presence detection offers something genuinely new: immediate bed exit alerts without a camera, without a wearable, and without a pressure pad. It's not a cure for wandering — nothing is. But it's a tool that helps you stay aware of what's happening at night — while letting your loved one keep their dignity. It's not a substitute for medical monitoring or emergency alert systems, but it fills a real gap in everyday awareness.

And it lets you sleep. That matters more than you probably want to admit.