Sundowner’s Syndrome: Causes, Symptoms, and Treatments


A person with sundowner’s syndrome experiences increased episodes of confusion, agitation, and activity as the day progresses to night. There may be agitation and personality changes that are dramatically unlike the person’s normal behavior.

This can be frightening for the individual and their caregiver.

While most people are “winding down” or relaxing as the day goes on, those with sundowner’s syndrome become increasingly active.

Sundowner’s syndrome is often associated with dementia, a condition that affects a person’s memory, personality, and their ability to reason.

There are nonmedical ways to reduce the incidence of sundowner’s syndrome. Prescription medications can enhance sleep, and they may also reduce symptoms.

Treatment aims to ensure the person with sundowner’s does not experience severe fear or accidentally injure themselves.


Causes of sundowner’s syndrome

As the day goes on, regular activities can become tiring for a person with dementia. By late afternoon, the person can be totally exhausted. This exhaustion may progress through the evening.

People with dementia may find late afternoon and evening a particularly difficult time.

Dementia can lead to confusion and difficulty with processing and reasoning. It can also affect the internal body clock that recognizes when it is daytime and nighttime and, therefore, time to sleep.

If the body clock is not working properly, sleeping and waking patterns may be disrupted, and they can cause the confusion and exhaustion that feature in sundowner’s.

Other events that may lead to symptoms include:

  • Hospitalization or moving to a new, unfamiliar place
  • Medications wearing off as the day goes on
  • Transitions from day to night, reminding a person of when they were younger and expecting a spouse or children to come home

Hormonal imbalances may also play a role.

Risk factors

Some risk factors have been associated with sundowner’s syndrome.

One is Alzheimer’s disease. Around 20 percent of people with Alzheimer’s will experience some degree of sundowner’s syndrome.

A person with a history of alcohol or substance abuse also has a higher chance of experiencing sundowner’s, often with more severe symptoms.

Some behavioral cues are linked to a higher risk of symptoms.

These cues include:

  • Changes to day and night experiences, such as poor sleep
  • Increased stress, such as after visiting an unfamiliar place or going to see a doctor
  • Low lighting and shadows that can increase paranoia and fear
  • Having a frustrated and exhausted caregiver
  • Difficulty separating dreams from reality

Symptoms of sundowner’s syndrome

Symptoms of sundowner’s syndrome typically occur between the hours of 4:30 in the afternoon and 11:00 in the evening.

Sundowner’s syndrome can lead to sleep problems.

These include:

  • Confusion as to where or who a person is
  • Mental confusion that will not respond to reasoning
  • Paranoia
  • Sleep disturbances, such as inability to sleep at night, possibly leading to excessive sleep during the day
  • Sudden changes in behavior unexplained by any other trigger
  • Trouble speaking clearly
  • Trouble thinking clearly
  • Visual hallucinations
  • Wandering
  • Yelling or aggressive behavior

Those with sundowner’s syndrome have usually been diagnosed with some form of dementia, such as Alzheimer’s disease. However, not everyone with Alzheimer’s disease or dementia will have sundowner’s syndrome.


Sundowner’s syndrome can increase the likelihood of injury in a person with dementia. They may fall or remove a necessary medical device.

Sometimes, the person may become violent or highly agitated, potentially resulting in injury to themselves or others.

Research published in Psychiatry Investigation suggests sundowner’s syndrome may speed up the decline in mental function in a person with Alzheimer’s disease.

When to see a doctor

Sometimes it can be difficult to distinguish between sundowner’s syndrome and delirium that results from another condition.

In an older person, an underlying infection, such as a urinary tract infection, can cause symptoms similar to those of sundowner’s syndrome.

Changes to medications or adding new medications can have a similar effect.

If the person starts behaving in an unusual way during the evening, a caregiver should seek medical attention.

No definitive test can detect sundowner’s syndrome. A doctor will ask a caregiver about symptoms and will try to rule out other potential causes, such as an infection or medication change.

Lifestyle tips for sundowner’s syndrome

It can be difficult for a caregiver to see the changes in personality when the person they care for has sundowner’s, but there are some ways to alleviate symptoms and to help a confused person to remain calm.

Engaging in activity can help to establish a routine with good sleep patterns.

Sundowner’s is largely triggered by changes in light. Bright surroundings indicate daytime, while dark ones usually indicate night.

It is the fading light and the onset of nighttime that can trigger the symptoms of sundowner’s, so it is important to get lighting right.

People should keep the lights bright as the daylight fades and then use nightlights or low-light lamps throughout the night. These low-level lights will help a person know where they are if they wake up in the night.

There are a number of other ways to help a person with sundowner’s syndrome to stay oriented to their surroundings.

Examples include:

  • A vision check: This is important to ensure the person is still seeing clearly. Someone who cannot see shapes clearly is more likely to experience visual hallucinations.
  • Sleeping and waking schedule: Maintaining regular waking and sleeping times can increase familiarity and enhance sleeping. A person with sundowner’s should be encouraged to have a mid-morning nap, but not to have another nap before bedtime.
  • Eating regularly: Ensuring meals are eaten at similar times each day can help. During the evening, it is better to avoid items that can disturb sleep, such as nicotine, caffeine, alcohol, large meals, and excessive quantities of sweets.
  • Activities: Engaging in activities to redirect the person’s thinking may reduce confusion or uncertainty. Examples include folding napkins or laundry, watching television, or listening to music. Activities and outings such as medical appointments, bathing, or other errands can aid sleep at night.
  • Avoid disruption: Caregivers should try to avoid triggers known to contribute to symptoms. Events that can distract a routine or disrupt the sense of calm include loud television, boisterous children, or loud music.
  • Music: Many older people with sundowner’s syndrome enjoy listening to soft music from a favorite era. The music is familiar and many elderly people with sundowner’s may find it soothing.
  • Declutter: Keeping a house tidy and free of clutter can prevent confusion and reduce the risk of injury.

If the individual is upset or confused, a caregiver can help by doing the following:


  • Approach them in a calm manner
  • Refrain from arguing, but calmly and gently remind them of the time
  • Reassure them that everything is okay
  • Allow them to pace or do whatever is necessary until the episode starts to subside
  • Refrain from physically restraining them


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