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The predictable pattern of worsening confusion, agitation, or distress in people with dementia in the late afternoon and early evening. Cause is multifactorial (fatigue, circadian rhythm changes, environmental cues); responds to environmental adjustments, scheduling, and sometimes medication.
Sundowning is one of the most under-named experiences of dementia caregiving. Around 20% of people with Alzheimer's and a meaningful share of other dementias experience predictable worsening of confusion, agitation, pacing, anxiety, or distress in the late afternoon and early evening — usually starting between 3pm and 6pm, peaking around dinnertime, and often easing as the patient settles for the night. The trigger is multifactorial: fatigue accumulated over the day, the circadian-rhythm disruption common in dementia, the visual cues of fading daylight, low blood sugar before dinner, the social transition from the day's structure to evening, and (in facility settings) shift changes that disrupt familiar caregiver presence.
Families often describe the experience without knowing it has a name: "she's a different person in the afternoon," "the meltdown always happens around 4," "I dread dinner time now." Learning the pattern is named — and predictable — changes how families plan. The best-evidence interventions are environmental, not pharmacological:
• Bright light therapy in the morning (30-60 min of 10,000-lux light) can shift the circadian rhythm and reduce afternoon agitation • Maintaining a consistent daily schedule with the most demanding activities in the morning when the patient is most lucid • A late-afternoon "rest" period (not napping, but quieter activity) before the sundowning window • A predictable, calming dinner environment — same place, same people, minimal background noise, no TV news • Limiting caffeine and sugar after noon • Avoiding scheduling appointments, visitors, or major decisions in the late afternoon • Watching for triggers like UTI (which can spike agitation in dementia), pain, hunger, or constipation — sudden worsening of sundowning often means something else is going on medically
Medications are a last resort. Antipsychotics are commonly prescribed and carry FDA black-box warnings for increased mortality in elderly dementia patients; they should be a short-term intervention for severe agitation, not a long-term sundowning management strategy. Trazodone, melatonin, and low-dose SSRIs are sometimes used; an experienced geriatric psychiatrist is the right consult.
After a few months of dementia caregiving, most families have lived it without knowing it had a name. Learning the pattern is named makes it easier to plan around.
Terms families frequently confuse with sundowning.
ICU delirium is acute confusion that develops in the hospital, often resolves once the patient is home, and has different triggers (sedating medications, sleep deprivation, immobility). Sundowning is a chronic, recurring pattern in people with established dementia and follows a daily clock rather than the trajectory of an illness.
See also: all glossary terms · conditions by name · step-by-step playbooks