The Sleep Challenges Faced by Patients with Alzheimer's Disease

Alzheimer's disease, as a common form of dementia in the elderly, has an insidious onset and accounts for approximately 60% of all dementia cases. In 2015, the number of people living with dementia worldwide exceeded 47 million, and it is projected to reach around 150 million by 2050. This condition severely impacts patients' health while also placing a substantial burden on society and the economy.

Patients with Alzheimer's disease experience a range of symptoms, with particularly notable decline in recent memory, along with abnormalities in language, personality, and behavior. Among these, sleep problems are especially distressing for both patients and their families, often leading to institutionalization and even accidents. It is important to note that sleep naturally changes with age even in healthy individuals. Beginning in middle age, total sleep time decreases by an average of about 30 minutes per decade. Sleep becomes lighter and more fragmented, nighttime awakenings increase, deep sleep decreases, and early evening drowsiness and early morning waking become common. However, sleep issues are considerably more pronounced in patients with dementia.

I. Specific Manifestations of Sleep Problems in Dementia Patients

1.Circadian Rhythm Disruption
The patient's sleep-wake cycle loses a clear 24-hour pattern. Nighttime wakefulness is prolonged, sleep is fragmented, daytime naps become irregular and more frequent, and the patient may be more active at night than during the day. This issue is more pronounced in patients with limited sun exposure.

2.Excessive Daytime Sleepiness
Some patients frequently doze off involuntarily during the day. This not only interferes with eating but also reduces overall quality of life. While some patients sleep normally at night, others only take brief naps.

3.Difficulty Falling Asleep and Staying Asleep
Patients may toss and turn in bed, getting up and lying down repeatedly. Some may fall asleep quickly but then awaken frequently during the night, waking up too early in the morning, leaving them without adequate rest. Reduced daytime activity can further exacerbate this problem.

4.Abnormal Behaviors During Sleep
For example, Restless Legs Syndrome can cause patients to experience discomfort in their legs after falling asleep, compelling them to get out of bed and move around for relief. Additionally, some patients experience snoring and sleep apnea; approximately 33% to 53% of individuals with Alzheimer's disease have such issues, which can further worsen the progression of dementia.

II. The Bidirectional Relationship Between Dementia and Sleep

There is a bidirectional relationship between sleep disturbances and Alzheimer's disease. On one hand, sleep disturbances can increase the burden of beta-amyloid, thereby raising the risk of developing Alzheimer's dementia. Abnormalities in sleep duration, efficiency, and quality can all elevate this risk. Poor sleep habits can lead to reduced clearance and increased accumulation of beta-amyloid, damaging the brain cells that regulate sleep. On the other hand, the neuropathological changes caused by Alzheimer's disease also affect the brain's sleep regulation centers. Furthermore, sleep disturbances can interfere with nocturnal memory consolidation, thereby worsening dementia symptoms. [1]

In dementia patients, sleep problems may stem not only from the disease itself but also from co-existing multiple age-related physical conditions, such as heart disease or chronic obstructive pulmonary disease, the use of certain medications, or the presence of anxiety and depression.

III. Strategies to Help Dementia Patients Return to a Normal Sleep Rhythm

1.Provide a Favorable Living Environment
Keep the living space bright and well-ventilated during the day, ensuring the patient gets at least two hours of sunlight exposure. At night, create a quiet, warm, and comfortable environment to help the patient relax and prepare for sleep.

2.Establish a Regular Sleep Schedule
Limit daytime naps to no more than one hour to prevent excessive daytime sleep from disrupting nighttime rest.

3.Enrich Daytime Activities
Arrange activities such as playing cards, gardening, walking, and simple household chores to help the patient expend energy. Sufficient daytime activity helps the patient fall asleep more easily at night and improves sleep quality.

4.Implement Pre-Sleep Health Education
Avoid large meals and stimulants like caffeine and alcohol before bedtime. Soothing music can be played, and relaxation exercises such as deep breathing or meditation can be guided to help the patient wind down and prepare for sleep.

5.Utilize Physical Therapies
Options include transcranial magnetic stimulation therapy or bright light therapy. For patients with co-existing obstructive sleep apnea, using a non-invasive positive pressure ventilator may be considered to improve breathing during sleep.

6.Consider Medical Intervention When Necessary
Under a doctor's guidance, patients may take melatonin or medications that address dementia symptoms. However, sedatives should generally be avoided due to risks of dependency and side effects. Concurrently, actively treating co-existing physical illnesses and mood disorders is essential to fundamentally improve the patient's sleep condition.

Sleep problems in Alzheimer's disease accompany the entire course of the illness. A better understanding of these issues by caregivers can not only reduce caregiving difficulties but also help slow the progression of dementia, allowing patients to live more stable and peaceful lives.

[1] Merve Aktan Süzgün, et al. Sleep Abnormalities and Risk of Alzheimer’s Disease. SPRINGER NATUER. Volume 25, article number 67, (2025)

https://link.springer.com/article/10.1007/s11910-025-01451-5