Sleep Problems in Dementia

Why people with dementia often sleep too much by day and too little at night, what else can disrupt their sleep, and practical steps caregivers can take to help everyone rest.

Last reviewed: October 2026

Night after night of broken sleep is one of the hardest parts of living with dementia—for the person and for whoever is caring for them. Your loved one may doze through the afternoon, then be wide awake and restless at 2 a.m. You may be up checking doors, answering questions or guiding them back to bed. Understanding why this happens is the first step toward better nights.

What sleep problems look like

The National Institute on Aging (NIA) says Alzheimer's disease often affects sleeping habits. People may experience:

Sleeping a lot, or not enough
Waking up many times during the night
Napping a lot during the day
Sundowning—restlessness, agitation, irritability and confusion as daylight fades (see Sundowning)

Some people get up at night and dress for work, look for someone, or try to go outside, which can be a safety risk. See Wandering.

Why it happens

Several things work together, according to NIA and the Alzheimer's Association:

Changes in the brain itself. NIA notes that Alzheimer's itself can cause brain changes that disrupt sleep. The Alzheimer's Association describes a "mixed-up internal body clock": the person feels tired by day and awake at night.
Exhaustion from a full or confusing day.
Low light and shadows in the evening, which can be misread and lead to fear or hallucinations.
Dreams that are hard to separate from reality on waking.
Less need for sleep, which is common in older adults.
Picking up on stress in the people around them.
Medical problems. The Alzheimer's Association lists urinary tract infections, incontinence, restless legs syndrome and sleep apnea as things that can cause or worsen sleep problems. Pain, depression and side effects of medicines can also play a role (NIA).

A special note on Lewy body dementia

NIA notes that sleep disorders are common in Lewy Body Dementia but often go undiagnosed. One to know about is REM sleep behavior disorder: the person seems to act out their dreams, with vivid dreaming, sleep talking, violent movements or even falling out of bed. Dreams often involve being chased or attacked. NIA says this can appear years before other symptoms of Lewy body dementia. People with Lewy body dementia may also have excessive daytime sleepiness (sleeping two or more hours during the day), insomnia, or restless legs.

If your loved one acts out dreams, tell their doctor. A sleep specialist can help, and safety steps—like moving sharp objects away from the bed—may be needed.

Tips for better days and nights

Good sleep starts in the morning. These tips come from NIA and the Alzheimer's Association.

During the day

Get outside or sit by a sunny window, especially in the morning. Daylight helps keep the body clock on track.
Be active every day—a walk, gardening, chair exercises or dancing to music. See Exercise and the Brain.
Schedule demanding activities early, such as bathing, appointments and outings, when the person is more alert.
Limit naps, especially long naps or dozing late in the day, if nighttime sleep is a problem.
Serve the largest meal at midday and keep dinner lighter.
Cut back on caffeine, alcohol and nicotine, particularly later in the day.

In the evening

Set a calm mood: soft lighting, less noise, soothing music the person enjoys.
Avoid overstimulation: busy TV, chores or loud conversations can add to confusion.
Keep the home well lit as it gets dark, to reduce shadows.
Follow a regular schedule: wake up, eat and go to bed at the same times every day, including weekends and when traveling.
Create a bedtime routine: lowered lights, a cool room and no screens.
Use nightlights in the bedroom, hallway and bathroom.

For more on building a steady routine, see Daily Care and Routines.

If the person wakes up upset

The Alzheimer's Association suggests:

Approach calmly and ask if they need something—the bathroom, water, a blanket.
Gently remind them of the time.
Reassure them that everything is all right. Avoid arguing.
Don't use physical restraint. If they need to pace, let them do so with supervision.

What about sleeping pills?

For sleep problems caused mainly by Alzheimer's, the Alzheimer's Association says most experts encourage non-drug approaches first. When those don't work, a doctor may sometimes prescribe medicine. Work with the doctor to understand the risks and benefits before deciding. Don't give over-the-counter sleep aids or someone else's prescription without checking first—some medicines can make confusion worse. See Medications That Can Affect Memory.

Caregivers need sleep, too

NIA points out that when a person with Alzheimer's sleeps poorly, the caregiver usually does too. Chronic sleep loss wears down patience, health and judgment. Consider:

Taking turns with family members for night duty
Asking about in-home help or overnight respite—see Respite Care
Napping when your loved one naps
Talking to your own doctor if you're exhausted

See Caregiver Stress and Burnout for more ways to protect your health.

When to see a doctor

Talk with the person's doctor if:

Sleep problems continue despite changes in routine
They act out dreams, snore loudly or stop breathing during sleep
They're sleeping far more than usual or are hard to wake
Sleep changes come on suddenly, or along with new confusion, fever or pain
Nighttime wandering puts them at risk

A doctor can look for medical causes—such as an infection, pain, sleep apnea or a medicine side effect—and suggest solutions. Sudden changes in sleep and confusion can be a sign of delirium, which needs prompt care; see Delirium vs. Dementia. This article is general information and isn't a substitute for advice from your own doctor.

Sources

Not medical advice. This article is general information, not a diagnosis or treatment plan for any individual. Talk with a doctor about your situation.

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We may answer common questions in future updates (we won't share your name). We can't give personal medical advice; for urgent help call the Alzheimer's Association Helpline at 800-272-3900.

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