An empty bed in darkness

Is it typical for people with dementia to sleep a lot during the day?

People with dementia, especially those in the later stages, can often spend a lot of time sleeping. This can sometimes be worrying for carers, friends and family. Find out why a person with dementia might sleep more than an average person of their age.

It is quite common for a person with dementia, especially in the later stages, to spend a lot of their time sleeping – both during the day and night. This can sometimes be distressing for the person’s family and friends, as they may worry that something is wrong. 

Sleeping more and more is a common feature of later-stage dementia. As the disease progresses, the damage to a person’s brain becomes more extensive and they gradually become weaker and frailer over time.

As a result, a person with dementia may find it quite exhausting to do relatively simple tasks like communicating, eating or trying to understand what is going on around them. This can make the person sleep more during the day as their symptoms become more severe. 

Some medications may contribute to sleepiness. These include some antipsychotics, antidepressants, antihistamines and of course sleeping pills.

Sleeping disorders unrelated to dementia, such as having breathing that occasionally stops during sleep (known as ‘apnoea’), can also contribute to sleeping for longer. 

What should I do if a person with dementia is sleeping a lot? 

If the person is in the later stages of dementia and they have gradually started sleeping more and more, it is likely to be due to the dementia progressing.  

However, if the excessive sleeping has started more suddenly, or the person doesn’t seem well in other ways, it may have another cause.  

If this is the case you should speak to the GP, to rule out any infections or conditions that could be affecting the person's sleep. It may also be worth asking for a medication review with the GP or speaking to a pharmacist as medication can cause a range of side effects. 

Providing the person doesn’t appear to be uncomfortable or distressed, then sleeping more during the day isn’t normally a reason to be worried.

However, if a person is lying down in bed and asleep for most of the time they will need to be looked after to make sure they don’t develop any physical health problems. This sort of care is normally done by a health or social care professional in a care home or hospice. If the person is still living at home though, then it’s important to get advice from your GP or nurse on how best to do this.

Why does dementia affect sleep? 

Problems with sleep are very common for people with dementia. They can include: 

  • sleeping during the day and being awake and restless during the night 
  • becoming disorientated in the dark if they wake up to use the toilet 
  • waking up more often and staying awake longer during the night 
  • getting up in the early hours and thinking it’s day time or time to go to work (disorientation in time) 
  • not being able to tell the difference between night and day. 

Nobody completely understands why dementia affects sleeping patterns. For some people, it may be that their internal ‘biological clock’, which judges what time it is, becomes damaged so the person starts to feel sleepy at the wrong time of day.

There are also other parts of the brain which control whether or not we stay awake, and these may also not work properly if they become damaged.  

Sometimes a person with dementia might completely reverse their normal sleep pattern, staying up all night and then sleeping all day. 

Sleep and dementia

It's common for people with dementia, especially in the later stages, to spend a lot of their time sleeping

Does quality of sleep matter for people with dementia? 

The quality of a person's sleep gradually deteriorates as they get older. They tend to get less deep or ‘slow-wave’ sleep, which helps to keep the brain healthy and refreshed. 

Even though a person with dementia may end up sleeping more than a typical person of their age – even as much as 14–15 hours a day – it is unlikely to all be good quality sleep. 

Sleeping a lot can also be influenced by people’s sleeping patterns before they had dementia, as some people need more sleep than others. 

Sleep for people who have dementia with Lewy bodies and Parkinson’s disease 

The type of dementia you have can affect your sleep.

People who have dementia caused by Lewy body disease, such as Parkinsons’ disease (PD) or dementia with Lewy bodies (DLB) are often sleepy by day but have very restless and disturbed nights. They can suffer from confusion, nightmares and hallucinations. Insomnia, sleep apnoea (breathing difficulties) and restless legs are common symptoms. 

A person affected with these types of dementia may often unknowingly ‘act’ out their dreams by shouting and moving around in bed.

They can even cause injury to themselves and/or their sleeping partner. This is called rapid eye movement (REM) sleep behaviour disorder or RBD, and tends to happen from the earliest stages of the disease onwards.

This can be exhausting and often leaves the person feeling like they haven’t slept at all, so they are very tired and sleepy during the day.

It can be hard to stay awake during the day after a poor night’s sleep but, if possible, it’s best to try to limit sleep during the day to small bursts or ‘catnaps’. Otherwise the person’s body clock can become very confused and this makes sleeping well during the night even harder.

Read more about sleep and dementia

Learn more about how dementia can affect sleeping patterns, as well as our tips for healthy sleep.

Sleep and dementia

This article was first published in 2019. It was most recently updated on 29 January 2024.

755 comments

I care for a lady of 99 with dementia, currently she has 4 carers throughout the day, but nobody at night with her and I worry about this. She doesnt know shes in her own home most of the time and tends to get up all hours in the night, get dressed etc. Should she have someone with her as i worry she'd be very disoriented and scared?

Hello Helen,
Thanks for getting in touch. We recommend speaking with one of our dementia advisers so you can discuss the current situation about the lady you care for. Our advisers will be best placed to provide you with information, advice and support. Please call our Dementia Connect support line on 0333 150 3456. (More information on opening times: https://www.alzheimers.org.uk/get-support/dementia-connect-support-line)
Wishing you all the best, Helen.
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Alzheimer's Society blog team

My father is 76, a lifelong smoker, has MDS, COPD and diabetes Ii. He lives with my family and we have an 11 and 12 year old. He no longer takes care of himself, sleeps 20 hours a day, has horribly droopy and tearing eyes, fecal incontinence while asleep and falls out of bed fairly often while sleeping. His hemoglobin was so low for so long(between 7-9) but he just started a barely approved drug and jumped to 12. We thought that would be our salvation but nothing has changed. Is this dementia? He wakes at 7:30pm and thinks it’s morning. He’s very confused and yet seems “with it” at other times. He is an uncooperative patient! I now have to manage and dole out all meds. Blood sugars are being well managed with only Metformin.

My wife is 61 and she sleeps a lot during the day and some simple things she doesn't know how to do. What can I do to help her

The concern for my dad that I have is how weak he is when he does get up. But if he’s not eating or drinking for 18+ hours at a time, I feel like that is a problem too. Sometimes he’s up wandering all night and sometimes he sleeps for 24 hours. I just don’t know what is the right thing to do.

Hi Colleen,
Thanks for getting in touch.
We recommend speaking with one of our dementia advisers on 0333 150 3456. They can listen to your concerns about your dad, provide advice and support. Our advisers are available seven days a week. You can find opening hours for our Dementia Connect support line here: https://www.alzheimers.org.uk/get-support/dementia-connect-support-line
We hope this helps, Colleen.
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Alzheimer's Society blog team

Good to read people's comments. I look after by 91yr old Father, who has started sleeping for 2 days in a row and then gets up for a day or 2 and sleeps in the afternoon. Keeping him hydrated is my main issue. If he is in bed asleep at least I know he is safe, warm and comfortable. So terribly sad to see your loved one go through this evil disease.

Hi , my father has Hallucinations, he talks to people who doesn’t exist, and he also think there is people that attacking him while he is asleep, sometimes he tries to cook a meal and he is about to go out and give it to her imaginary girlfriend! He doesn’t sleep as much , he wakes up a few times and he fights with imaginary people. But he remembers the past, it’s like he didn’t forget anything he just talks nonetheless and he sees not real things! I know it’s really hard for him, but it’s also hard for me to take care of him and I can’t even have a good sleep, I wake up every a few hours because of him fighting, my headache won’t go away and U have no one else to take care of him. I would really love if you can help me how to mange This situation.

I’m only 46 and sleep about 14 hours each day. No trouble sleeping at night but husband says I speak out a lot. Already diagnosed in 2017 w cognitive disorder. Of course appointment w neuropsychologist was postponed. Also have neuromuscular disease. Scared.

Sherry, I was immediately heartbroken over reading about your age and diagnosis. I was especially moved when you stated that you are scared. I pray that your faith will rest in the God of all comfort and that he gives the medical doctors insight into the right meds for your condition. I pray that your husband is loving, kind, supportive and understanding. God bless🙏

Hi Sherry. You are not alone. I was Dx @ 47 years old with cognitive impairment. I sleep 12-14 hrs on most nights. I am also fearful of living with this dreaded disease. Please get in touch with me. Maybe we can support each other through this journey.

My husband has vascular dementia and mixed Alzheimer’s he sleeps at least 15 hours.If I have to get him up earlier he is exhausted. I used to worry about it and got very little information from the medics . I have learned to roll with it and it is less stressful. Thankyou for this article.

Hi my name is Betsy my 68 year old husband was diagnosed a year ago with late stage Alzheimer’s/ Dementia. He has gone down hill so fast he sleeps like 20 hours a day, don’t talk hardly at all to me or his kids. His eating is okay but he has cut down drastically and I have to keep telling him to eat he thinks he already did. He don’t remember how to use anything where to go or where something is even when it’s right in front of him. He cries all the time when he is up about his legs feet and back killing him. And out of no where he will get very nasty with his mouth. Then he cries and tells be he wants to die but can’t live without me.

Hi, my aunty had dementia. At night she will be awake and keep walking around home doing cleaning and checking the home lock. Does anyone knows how can I put her into sleep?

My husband is 61. Ever since his first stroke in October 2017 his condition has continually deteriorated. He is now left with vascular dementia due to all the TIAs or mini strokes that keep happening. He sleeps more and more and more to the point he is prone on our couch all day except to eat or shower and toilet. Then he sleeps all night as well. So he is easily sleeping 18-20 hrs. in 24. EVERYTHING is exhausting for & Ever since November 2019 when he woke up feeling dizzy he has been in a constant state of dizziness since then which has greatly affected his gait and balance.

This is so helpful!!!! I was really becoming concerned. I took my aunt to the doctor and she had all kinds of tests and all were normal... but I was still worrying about her sleeping so much. I'd always try to wake her periodically, but hearing that it's normal in later stages, I'm relieved.

My husband is only 68 and has frontal lobe dementia. He sleeps a lot during the day and night. He falls out of bed a lot

I just learned that dementia patients in nursing homes often sleep during the day because they are overwhelmed by the chaos of a busy place during the daytime. They get sensory overload and they can’t cope. But at night, when the lights are dim and it’s quieter, they can explore their space and feel calmer and a little more in control. Knowing this brought be a lot of comfort. Not trying to “fix” it anymore. My dad is 94 and seems to sleep all day but is up and pleasant at night!

I am feeling so lost right now. My husband has Alzheimer’s and he has just about lost the ability to walk. I am the sole care giver and there is so much I don’t know. He will sleep until 5 in the afternoon if I let him. I try to get him to walk and exercise but it seems like a lost cause. I promised him I would keep him home but I don’t have any idea what to do to help him and me.