For many people living with dementia, the sunset marks the beginning of the most difficult part of the day. What was once a predictable nighttime routine often shifts into a cycle of frequent waking, wandering, and ‘sundowning’ confusion.
Research suggests that sleep disturbances affect a large proportion of people living with dementia, with approximately 60–70% experiencing disrupted sleep patterns or sleep-related problems [1].
These sleep disturbances do not just lead to exhausted mornings; they can actually worsen cognitive symptoms, creating a challenging cycle for both the individual and their caregivers. Understanding the relationship between sleep and dementia can help families recognize warning signs early and improve the quality of life for those affected.
In this article, we will explore why sleep problems occur in dementia, the common sleep problems and tips to manage them, and the warning signs to watch for.
Why Do Sleep Disturbances Occur in People with Dementia?
Sleep and dementia have a complex, two-way relationship. Dementia damages the parts of the brain that regulate sleep-wake cycles; meanwhile, inadequate sleep can exacerbate symptoms like memory loss and agitation, potentially accelerating the course of the disease. For families already juggling the intense demands of caregiving, this creates a challenging cycle where sleep issues and cognitive decline constantly aggravate one another.
Sleep problems in dementia are not random; they are usually the result of multiple overlapping factors. They are rooted in physical and chemical changes within the brain that directly interfere with the body’s ability to regulate normal sleep patterns.
Identifying these underlying causes can lead to more effective management strategies, enabling caregivers to respond with increased understanding and patience.
The following are the underlying mechanisms that contribute to sleep disruptions.
Damage to the Brain’s Sleep Centers
Dementia causes progressive degeneration in areas of the brain that control the sleep–wake cycle. In conditions such as Alzheimer’s disease, damage to the hypothalamus and other regulatory centers disrupts circadian rhythms, the internal clock that signals when to feel awake or sleepy. As these systems weaken, individuals may struggle to maintain consistent sleep patterns.
Reduced Melatonin Production
Melatonin is a hormone that plays a key role in regulating the circadian rhythm, signaling to the body that it is time to prepare for sleep. People with dementia often produce lower levels of melatonin, especially in the evening. This reduction makes it harder to fall asleep and stay asleep, contributing to insomnia and nighttime restlessness.
Changes in Sleep Architecture
Healthy sleep cycles through light sleep, deep sleep, and REM (Rapid Eye Movement) sleep (the stage of sleep when most dreaming happens). Dementia can decrease the amount of time spent in deep, restorative sleep and disrupt the normal sleep cycles. As a result, sleep becomes lighter, more interrupted, and less refreshing.
Neurochemical Imbalances
Different types of dementia affect brain chemicals that influence sleep. For example, in Lewy body dementia and Parkinson’s disease, changes in dopamine and other neurotransmitters can lead to REM sleep behavior disorder, where individuals physically act out dreams.
Behavioral and Psychological Issues
Agitation, anxiety, depression, and confusion, especially in the late afternoon or evening (often referred to as sundowning), can significantly disrupt nighttime rest. Also, some individuals sleep most of the day and remain awake at night, which is known as sleep-wake cycle reversal. As dementia progresses, reduced awareness of time and place may also lead to nighttime wandering.
Medical and Environmental Factors
Pain, urinary frequency, medication side effects, reduced daytime activity, and limited exposure to natural light can all worsen sleep disturbances. In institutional settings, nighttime noise or frequent checks may further fragment sleep.
Sleep Disorders Commonly Associated With Dementia & Tips to Manage Them
Sleep disturbances in dementia can develop into recognizable sleep disorders that significantly affect safety, cognition, and overall health. These disorders may vary depending on the type and stage of dementia, but several patterns are especially common.
Insomia
Insomnia is one of the most frequent sleep problems in dementia, which includes a wide range of sleep problems. Individuals may struggle to fall asleep, wake repeatedly during the night, have nightmares, and wake up very early and be unable to return to sleep. As a result, they do not receive enough good-quality sleep.
The following are the different causes of insomnia in a person with dementia.
- The person may be feeling pain or discomfort.
- They may be experiencing stress, anxiety, or depression.
- They may also be suffering from other health issues that interfere with their ability to sleep, like breathing or heart issues, heartburn, constipation, UTIs, or incontinence.
- Insomnia may be a side effect of the medications they are taking.
Treatment and Tips to Manage
Treatment for insomnia in people with dementia focuses primarily on non-medication strategies. These include:
- Establishing a consistent daily routine
- Maintaining fixed sleep and wake times
- Increasing daytime exposure to natural light
- Encouraging regular physical activity can help regulate the sleep–wake cycle
- Limiting daytime naps
- Reducing evening stimulation and creating a calm, dark, and quiet sleep environment.
Addressing contributing factors such as pain, urinary frequency, anxiety, depression, or medication side effects can significantly improve sleep quality. If non-drug approaches are not sufficient, medication may be considered cautiously.
Certain medications can help the person fall asleep. However, most have unpleasant or even harmful side effects, including dizziness and a higher risk of falls. This reduces their safety for the person with dementia. They are often only recommended for very brief periods of time when a patient has serious sleep issues.
REM sleep behavior disorder (RBD)
REM sleep behavior disorder (RBD) occurs when the normal muscle relaxation that happens during REM sleep does not function properly. Consequently, the individual may physically act out their violent dreams by talking, shouting, kicking, or flailing their arms and legs. These involuntary motions can be dangerous if they sleep next to their partner.
When a person has vividly unpleasant or violent dreams, they may wake up feeling drained and fatigued. The person typically has no recollection of these dreams.
RBD is strongly associated with Lewy body dementia and Parkinson’s disease. In some cases, it can appear years before cognitive symptoms develop. Because movements can be sudden or violent, RBD may pose injury risks to both the individual and their bed partner.
Treatment and Tips to Manage
Safety modifications are often the most important first step. Since individuals may kick, punch, or fall out of bed during episodes, making the sleep environment safe is essential:
- Remove sharp or breakable objects near the bed
- Place padding on the floor beside the bed
- Consider bed rails (if appropriate and safe)
- Move furniture away from the bedside
- In severe cases, temporary separate sleeping arrangements may be necessary.
Medications can help reduce dream-enactment behaviors. Melatonin is commonly recommended as a first-line treatment because it is generally well tolerated, especially in older adults. Clonazepam may also be prescribed and is often effective, but it must be used cautiously due to potential side effects such as sedation and increased fall risk.
Obstructive Sleep Apnea (OSA)
Obstructive sleep apnea (OSA) is a common sleep-related breathing problem. In this condition, the muscles at the back of the throat relax, obstructing the airways and temporarily restricting breathing. As a result, the person wakes up briefly to clear the airway.
It is common for people with OSA to wake up gasping or snorting. They may wake up five to thirty times each hour, depending on the severity of the condition, which significantly reduces the quality of their sleep.
OSA has been associated with cognitive decline and dementia, and it may raise your risk of developing both. It is more common in those with Alzheimer’s and vascular dementia. Untreated sleep apnea can:
- Reduce oxygen supply to the brain
- Fragment sleep repeatedly throughout the night
- Worsen memory and concentration
- Increase cardiovascular risk
When the person is awake, the illness may induce headaches, drowsiness, fatigue, and depression. Additionally, it may exacerbate dementia symptoms over time.
Treatment and Tips to Manage
Since sleep apnea can be a serious medical problem, a person with it should see their general practitioner. Making a few minor modifications to their sleeping habits may improve their quality of sleep, including:
- Sleeping on one side of your body
- Avoiding alcohol and smoking before bed
- Not taking sleeping pills (unless directed by a physician) since they may exacerbate the condition
Continuous positive airway pressure (CPAP) is another treatment for sleep apnea. When a person is sleeping, a machine gently pushes air via a mask worn over their mouth or nose. It keeps the airway from narrowing too much, allowing the person to access the oxygen they require for restful sleep and wake up less often during the night.
Restless Leg Syndrome (RLS)
Individuals with restless legs syndrome experience a compelling urge to move their limbs while at rest and awake. It is far more prevalent at night. Since they cannot properly relax, it may be more challenging for them to fall asleep at night.
They might experience uncomfortable feelings, such as tingling or aching, that only feel better if they continue to move. They may try to express their distress to you by rubbing, tapping, or hitting their legs if they have trouble speaking. People with restless legs syndrome may frequently feel the need to step out of bed and walk around at night.
RLS is common in those with dementia with Lewy bodies (DLB) or Parkinson’s disease dementia. Other medical conditions, including arthritis, diabetes, thyroid issues, kidney problems, and iron deficiencies, may enhance the risk of developing it. Additionally, it can be worse for those who use medications to treat depression and anxiety.
Treatment and Tips to Manage
Treatment for Restless Legs Syndrome (RLS) focuses on relieving symptoms and improving sleep quality. Initial management includes identifying and correcting underlying contributors such as iron deficiency, medication side effects, or chronic medical conditions. The doctor may recommend iron supplementation if blood tests show low iron levels.
The following lifestyle adjustments can also help alleviate symptoms:
- Reducing caffeine intake
- Maintaining a regular sleep schedule
- Engaging in moderate daytime exercise
- Incorporating leg massages or warm baths before bedtime
The healthcare professional may prescribe medications if symptoms are frequent or severe. These can include dopamine-related medications, certain anti-seizure medications, or other agents that calm nerve activity.
However, these drugs should be selected and used carefully for individuals with dementia to minimize side effects such as confusion or sedation. These drugs may also worsen delusions or hallucinations in individuals with pre-existing psychotic symptoms, especially those with Parkinson’s disease dementia or DLB.
Excessive Daytime Sleepiness
Dementia can interfere with the brain’s internal clock (circadian rhythm), disrupting the normal day–night sleep cycle. As a result, many individuals with dementia experience excessive daytime sleepiness.
It often stems from fragmented nighttime sleep, neurodegenerative changes affecting wakefulness centers of the brain, medication side effects, or coexisting sleep disorders. Frequent daytime napping can then make it even harder to achieve consolidated, restorative sleep at night.
Excessive daytime sleepiness increases the risk of falls, reduces participation in daily activities, and can worsen cognitive functioning. It may also contribute to further nighttime disruption, creating a difficult cycle to break.
This symptom is particularly common in Dementia with Lewy bodies, Parkinson’s disease, and in the later stages of Alzheimer’s disease. In these conditions, fluctuations in alertness may also be associated with increased confusion and, in some cases, visual hallucinations or delusional thinking.
Treatment and Tips to Manage
Treatment for excessive daytime sleepiness in people with dementia focuses on identifying and addressing the underlying cause. Because daytime drowsiness is often linked to poor nighttime sleep, improving sleep quality is a primary goal. This may include:
- Evaluating and treating nighttime sleep disorders (e.g., sleep apnea).
- Managing contributing medical issues such as pain or urinary symptoms.
- Reviewing medications that may cause sedation and adjusting them under medical supervision.
- Improving overall nighttime sleep quality to reduce daytime drowsiness.
Non-medication strategies are especially important and may include the following:
- Increasing exposure to natural daylight during the day.
- Encouraging regular physical activity appropriate to the ability level.
- Maintaining a structured daily routine.
- Limiting long or late-afternoon naps to protect nighttime sleep.
In some cases, particularly in conditions such as Dementia with Lewy bodies or Parkinson’s disease, careful medication adjustments may be needed to balance motor and cognitive symptoms without worsening drowsiness. Stimulant medications are rarely used and only under specialist supervision due to potential side effects.
Warning Signs Caregivers Should Watch For
As a caregiver, you are often the first to notice changes in your loved one’s sleep patterns. While some disruption is common in dementia, certain signs should prompt a medical evaluation. Recognizing these early can help prevent injury, reduce distress, and identify treatable causes.
Sudden or Worsening Insomnia
If your loved one begins struggling to fall asleep, wakes repeatedly at night, or rises very early and cannot return to sleep, especially if this change is new, it may signal pain, medication side effects, depression, anxiety, or an emerging medical issue.
Acting Out Dreams
Yelling, punching, kicking, or falling out of bed during sleep is not typical restlessness. These behaviors may indicate REM Sleep Behavior Disorder and can pose safety risks to both you and your loved one. Medical evaluation is important.
Frequent Daytime Drowsiness
If your loved one naps excessively, falls asleep during conversations, or seems unusually difficult to keep awake, fragmented nighttime sleep, medication effects, or an untreated sleep disorder such as sleep apnea may be contributing factors.
Increased Evening Confusion or Agitation
Heightened restlessness, pacing, irritability, or confusion in the late afternoon or evening can reflect circadian rhythm disruption. However, sudden worsening may signal infection, dehydration, discomfort, or another acute medical problem that requires attention.
Loud Snoring or Breathing Pauses During Sleep
Snoring combined with gasping, choking, or pauses in breathing may indicate obstructive sleep apnea. Since this condition can worsen cognitive symptoms and increase cardiovascular risk, a healthcare provider should assess it promptly.
If you notice any of these warning signs, particularly if they are new, severe, or rapidly worsening, consult a healthcare professional. Many sleep-related issues are manageable, and early intervention can improve safety, reduce caregiver strain, and enhance overall quality of life.
Support for Caregivers
Caring for someone with dementia who experiences sleep disturbances can be exhausting and emotionally challenging. Chronic sleep loss often leads to increased stress, fatigue, mood changes, and a higher risk of depression or burnout.
Over time, disrupted nights can affect a caregiver’s physical health, mental well-being, and ability to provide consistent care.
To manage these challenges, you should prioritize your own rest and seek support when needed. Options include:
- Respite care: Temporary relief through in-home caregivers or adult day programs allows caregivers to rest and recharge.
- Sleep clinics or medical evaluation: Consulting sleep specialists can help identify treatable causes of nighttime disruption, such as sleep apnea or REM sleep behavior disorder, benefiting both the individual with dementia and the caregiver.
- Memory care or assisted living support: In cases of severe sleep disturbances, professional care facilities can provide 24-hour supervision and structured routines that improve safety and sleep quality.
- Support groups and counseling: Connecting with other caregivers or mental health professionals can provide emotional support, practical strategies, and coping tools.
By addressing caregiver well-being proactively, families can reduce stress, prevent burnout, and maintain a safer, more supportive environment for both the caregiver and the person living with dementia.
Alzheimer’s Research Association is a non-profit organization dedicated to helping caregivers of Alzheimer’s disease and dementia. We provide the latest information and news about the illness and helpful tips to help caregivers cope with their daily caregiving challenges. We realize the most important thing that a caregiver needs is financial assistance. Therefore, we provide grants to caregivers to ease their financial burden. Caregivers can apply for grants here: Alzheimer’s Grant Application.
You can also help caregivers in their endeavor by donating as much as possible: Donation To Alzheimer’s Research Associations.
References
- Petrovsky, D.V., McPhillips, M.V., Li, J., Brody, A., Caffeé, L. and Hodgson, N.A., 2018. Sleep disruption and quality of life in persons with dementia: A state-of-the-art review. Geriatric Nursing, 39(6), pp.640-645.
- Sleep problems and treatments for people with dementia. Alzheimer’s Society. https://www.alzheimers.org.uk/about-dementia/stages-and-symptoms/sleep-problems-treatments-dementia. Accessed: 2nd March, 2026.
- When Dementia Disrupts Sleep: A Complete Guide to Helping Your Loved One Rest Better. The Key Home Care. https://thekey.com/learning-center/dementia-and-sleep. Published Online: 20th June, 2024. Accessed: 2nd March, 2026.
- Dementia and Sleep Problems: Causes, Effects, and Solutions for Better Sleep. Always Home Connected. https://alwayshomeconnected.com/blogs/news/dementia-and-sleep. Published Online: 17th October, 2023. Accessed: 2nd March, 2026.
