Memory & dementia
Sundowning: what helps at 4pm, and what makes it worse
Late-afternoon agitation has patterns. Most of them respond to light, timing and food before they respond to medication.
The short version
- Sundowning affects roughly one in five people with Alzheimer's disease.
- The trigger is usually fatigue, low light and hunger arriving together — not the time of day itself.
- Bright light in the late afternoon, an early supper and a fixed routine help more than anything else.
- Arguing with the content of a delusion reliably makes it worse.
What is actually happening
Sundowning is a cluster of behaviours — restlessness, pacing, suspicion, wanting to go home while already at home — that cluster in the late afternoon and early evening.
It is not a disease in itself and it is not deliberate. The working explanation is that the day's accumulated fatigue meets falling light, an empty stomach and a quieter house, and the person has fewer resources left to make sense of any of it.
What helps
Light first. Put the brightest lamps on at 3pm, before the agitation starts rather than after. Closing the curtains at dusk removes the confusing half-reflection in the window.
Then food. Move the main meal earlier and put something out at 3.30pm. Hunger is often the whole story.
Then routine. The same activity at the same time — folding laundry, a walk to the corner, a particular record — gives the hour a shape. Novelty at 4pm is the enemy.
Cut caffeine after lunch, keep the afternoon nap short and early, and try to have the calmest person in the household present at that hour.
What makes it worse
Correcting them. If your mother says she needs to collect the children from school, 'the children are fifty years old' is true and useless. 'They're fine, they're with Dad — sit with me for a minute' is neither a lie nor a correction, and it works.
Television news, crowded rooms, a stranger arriving at 5pm, and being asked to make decisions all reliably escalate things.
If a caregiver is coming, schedule them to arrive before the difficult hour rather than in the middle of it.
When to call the doctor
Sudden agitation that appears over a day or two, rather than building over weeks, is often a urinary tract infection, constipation, pain or a medication change — not progression of the dementia. That is a same-week GP call.
Medication for sundowning exists and carries real risks in older people. It is a reasonable conversation to have, and a reasonable one to have after the light, food and routine changes have been tried for a fortnight.
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