The earliest signs of sundowning are usually subtle shifts in mood and behavior that start in the late afternoon and stretch into the evening. You might notice increased restlessness, irritability, or confusion that seems to come out of nowhere as the day winds down. Sundowning affects a significant portion of people with Alzheimer’s disease and other forms of dementia, and recognizing the pattern early can make a real difference in how well it’s managed.
What Sundowning Looks Like Early On
The first signs are easy to dismiss or chalk up to a bad day. A person might become unusually anxious or agitated as afternoon turns to evening, even though they seemed fine that morning. They may start pacing through the house, rocking in a chair, or following their caregiver from room to room (sometimes called “shadowing”). These behaviors tend to appear around the same time each day, typically between 4 and 7 p.m., which is the key pattern to watch for.
Emotional changes often show up before the more disruptive behaviors. Early sundowning can look like sudden sadness, tearfulness, or fear that doesn’t have an obvious cause. The person might become more easily frustrated, snap at family members, or refuse to cooperate with routine tasks like getting ready for bed. They may also seem more suspicious than usual, asking who moved their belongings or questioning why someone is in their home.
As the pattern progresses, the signs become harder to miss. Confusion deepens. The person may not recognize familiar surroundings or may insist they need to “go home” while sitting in their own living room. In some cases, paranoia, delusions, or even hallucinations develop during the evening hours. Wandering, yelling, crying, and difficulty sleeping are all part of the sundowning spectrum, though not every person experiences all of them.
Why It Happens in the Late Afternoon
Sundowning is tied to the body’s internal clock, which is regulated by a small structure in the brain called the suprachiasmatic nucleus. This cluster of nerve cells controls sleep-wake cycles, body temperature rhythms, and hormone release. In Alzheimer’s disease, this area undergoes physical damage, including nerve cell shrinkage and the buildup of tangled proteins. The result is a flattened circadian rhythm, meaning the brain loses its ability to distinguish between daytime alertness and nighttime rest.
Melatonin, the hormone that signals your body it’s time to sleep, also plays a role. People with Alzheimer’s tend to produce less melatonin, and research published in the American Journal of Psychiatry found that their core body temperature peaks later in the day than normal. This delay suggests the brain’s clock is no longer properly synced with environmental cues like daylight and darkness. The late afternoon, when natural light fades and the body is already fatigued, becomes a perfect storm for confusion and distress.
Common Triggers That Make It Worse
Sundowning doesn’t happen in a vacuum. Several environmental and physical factors can bring on an episode or intensify one that’s already building:
- Low lighting and shadows. As daylight fades, dimmer rooms create shadows that can look unfamiliar or threatening to someone with dementia. They may misinterpret what they’re seeing, which fuels confusion and fear.
- Physical and mental exhaustion. A full day of activities, appointments, or stimulation can drain a person’s limited cognitive reserves. By late afternoon, they simply don’t have the mental energy left to process their surroundings.
- Caregiver stress. People with dementia are remarkably sensitive to the emotions of those around them. If you’re visibly tired, frustrated, or tense at the end of a long day, they pick up on it, and it can escalate their own distress.
- Too much evening stimulation. Television, loud music, household chores, or multiple people talking at once can overwhelm someone who is already struggling to make sense of their environment.
How Sundowning Differs From Delirium
It’s worth knowing the difference because the response is very different. Delirium comes on suddenly, often over hours or a couple of days, and it’s usually triggered by something medical: an infection, a new medication, dehydration, or pain. A person with delirium may have dramatically fluctuating awareness, and the confusion affects them around the clock, not just in the evening.
Sundowning, by contrast, follows a predictable daily pattern. The person is relatively more coherent in the morning and gradually worsens as evening approaches. If confusion appears for the first time and doesn’t follow a time-of-day pattern, or if it comes on very suddenly in someone who was previously stable, that warrants a medical evaluation to rule out delirium or another acute issue like a urinary tract infection.
Practical Ways to Reduce Sundowning Episodes
The National Institute on Aging recommends non-drug strategies as the first line of defense, and they can be surprisingly effective when applied consistently. The core principle is predictability: stick to the same schedule for meals, bathing, and bedtime every day. A structured routine reduces the number of decisions and transitions the person has to navigate, which lowers their cognitive load heading into the vulnerable evening hours.
Light exposure is one of the most studied interventions. Getting the person outside or near a bright window during the morning and early afternoon helps reinforce their circadian rhythm. For people who can’t get adequate natural light, bright light therapy using a 10,000 lux lamp for one to two hours in the morning has shown benefit in clinical trials. The goal is to give the brain a strong daytime signal so the transition to evening feels less disorienting.
In the afternoon and evening, focus on reducing stimulation. Turn off the television, keep noise levels low, and avoid starting new activities. Well before sunset, turn on lights throughout the home to prevent shadows from forming. Soft, familiar music can be calming. Keep beloved photos and objects visible, as these serve as anchoring cues for someone whose sense of place is slipping.
A few practical habits also help. Limit caffeine and alcohol after the morning. Discourage long or late-afternoon naps, since these can shift the sleep-wake cycle further out of alignment. Encourage physical activity earlier in the day, but don’t overdo it. The sweet spot is enough movement to promote healthy tiredness without creating the kind of exhaustion that triggers an episode.
When Sundowning Escalates
If an episode is happening in real time, stay calm and speak in a low, reassuring voice. Don’t argue with the person or try to correct their confusion. Instead, gently redirect their attention to something comforting: a favorite snack, a familiar blanket, or a simple activity like folding towels. Physical touch, like holding a hand or rubbing their back, can help if they’re receptive to it.
Some people with sundowning develop behaviors that are physically aggressive or that put their safety at risk, such as attempting to leave the house at night. If non-drug strategies aren’t enough to manage these situations, medication may be considered. This is a conversation to have with a doctor who can evaluate whether any underlying physical problems, like pain or a sleep disorder, are contributing to the severity of the episodes.