Sundowning: Why It Happens and What Actually Helps

Sundowning refers to a pattern, common in dementia, where confusion, agitation, anxiety, or aggression noticeably worsen in the late afternoon and evening, as described in the National Institute on Aging's guidance on coping with agitation, aggression, and sundowning. It's one of the more disorienting symptoms for families to witness, particularly because a parent can seem relatively calm and lucid during the day, then become distressed as evening approaches — and often just as the caregiver themselves is at their most tired.

Why it happens

The exact cause isn't fully understood, but contributing factors are thought to include disruption to the internal body clock (circadian rhythm), fatigue accumulated over the day, reduced lighting creating more visual confusion and shadows, and lower staffing or fewer people around in the evening in some care settings, which can increase feelings of disorientation — the NIA's guidance covers these contributing factors in more depth. Some caregivers also notice a pattern around shift changes or household transitions — a different person coming home, dinner preparation disrupting the household's rhythm — though this varies enough between individuals that it's worth observing your own parent's specific triggers rather than assuming a general cause applies.

What a sundowning episode can actually look like

Symptoms range widely in both form and intensity. On the milder end, this might look like increased restlessness, repetitive questioning, or a vague sense of unease your parent can't fully articulate. On the more difficult end, it can include pacing, attempts to leave the house ("I need to go home," even when already home), accusations directed at caregivers, or physical agitation. Recognizing your parent's specific pattern — what time it tends to start, what it tends to look like, how long it typically lasts — makes it easier to prepare for and respond to, rather than being caught off guard each time.

What tends to help, though responses vary by individual

• Maintaining a consistent daily routine, particularly around waking, meals, and bedtime — unpredictability tends to worsen symptoms.
• Managing light exposure — more natural light during the day, and turning on indoor lights before dusk to prevent the transition into darkness from becoming a source of confusion.
• Limiting caffeine and sugar later in the day, which can contribute to agitation and disrupted sleep.
• Reducing evening stimulation — a calmer, quieter environment as evening approaches, rather than a busy or noisy one. Some families move television watching, phone calls, or visitors earlier in the day and keep the evening deliberately low-key.
• Watching for and addressing unmet needs — sundowning symptoms sometimes mask simpler issues like hunger, thirst, needing the bathroom, or physical discomfort that a person with dementia struggles to communicate directly. Working through this checklist first, before assuming an episode is "just sundowning," can sometimes resolve it faster.
• Planning demanding tasks (bathing, medical appointments, difficult conversations) earlier in the day, when your parent is more likely to be at their calmest and most cooperative.

Redirecting during an episode

Staying calm and not arguing during an episode matters more than almost anything else on this list. Trying to reason with or correct someone during a sundowning episode tends to escalate distress rather than resolve it; redirecting attention gently is usually more effective than correcting or confronting. In practice, this can look like:

• Instead of "we're already home, this is your house" (a correction), try "let's go check on something in the kitchen" (a redirection to a different activity or room).
• Validate the underlying feeling without necessarily validating the factual claim — "it sounds like you're worried about getting home, let's sit down and figure it out together" acknowledges the distress without arguing about the facts.
• Offer a simple, calming activity — folding towels, looking through a familiar photo album, listening to music from their younger years — that gives their attention somewhere to land.
• If safe to do so, giving the person a few minutes of space rather than pursuing an argument in the moment can sometimes de-escalate an episode faster than continued engagement.

When to involve a doctor

If sundowning is severe, involves aggression that poses a safety risk, or is significantly disrupting sleep for both your parent and caregivers, it's worth discussing with their doctor — the NIA's Alzheimer's caregiving hub is a good starting point for finding relevant guidance — there are non-medication and, if needed, medication approaches that can help, and ruling out other contributing causes (like a urinary tract infection, which commonly causes sudden behavioral changes in older adults) is important. A sudden, sharp increase in sundowning severity — rather than a gradual pattern — is worth a call to the doctor specifically, since it can sometimes signal an underlying medical issue rather than dementia progression alone.