Sundowning Explained: Practical Help for Late-Afternoon Agitation in Dementia

By 4 in the afternoon you can feel it coming. Your wife starts pacing the kitchen. Your husband demands to go home, even though he is home. Voices rise. Patience runs out. Doors get locked and unlocked. The same questions repeat every two minutes. By dinnertime you are exhausted, and the evening still has hours to go.

This pattern has a name. Dementia specialists call it sundowning, and an estimated 20 percent of people with Alzheimer's experience it. The causes are not fully understood. Researchers believe it is some combination of disrupted circadian rhythms (the body's internal clock), fading daylight that worsens vision and depth perception, end-of-day fatigue, hunger, thirst, pain, overstimulation from a busy day, and shadows that the dementia brain misreads as threats.

The hardest part for a spouse caregiver is that sundowning often hits at the time of day when you are most tired yourself. Your patience is lowest, your decision-making is fuzzy from hours of caregiving. And you may also be trying to cook dinner. Add darkness and a confused, frightened partner, and a normal evening can become a crisis.

The good news is that sundowning responds well to environmental changes. You cannot reason a sundowning person back to calm. But you can change the room, the light, the noise, and the schedule in ways that reduce how often these episodes happen and how bad they get. The strategies below come from the Alzheimer's Association, the National Institute on Aging, and the experience of thousands of spouse caregivers.

A note on medication: doctors sometimes prescribe low-dose melatonin, antidepressants, or in severe cases antipsychotics for sundowning. Antipsychotics in older adults with dementia carry a black-box warning from the FDA for increased risk of death and should be a last resort, used at the lowest dose for the shortest time, with regular review. Always have a real conversation with your spouse's doctor before starting or stopping any medication.

This is not medical advice. For nighttime crises that feel unsafe, the Alzheimer's Association 24/7 Helpline at 1-800-272-3900 has specialists who will stay on the phone with you until things calm.

(Sources: Alzheimer's Association — Sleep Issues and Sundowning; National Institute on Aging — Tips for Coping with Sundowning; Mayo Clinic — Sundowning)