Side Effects

Sleep Problems

Many people with cancer have trouble sleeping. This could mean you have trouble falling or staying asleep. Or it could mean you sleep longer than usual at night. Some health issues, like restless legs syndrome, can also make sleep worse.

Any change in how you usually sleep can make it harder to get through your day. But treatments are available, and there are steps you can take to help manage your cancer-related sleep problems.

What types of sleep problems can happen when you have cancer?

You might face a few types of sleep problems during your cancer and treatment.

  • Insomnia: Having trouble falling asleep or staying asleep.
  • Hypersomnia: Feeling very sleepy during the day, sometimes sleeping longer than usual at night.
  • Restless legs syndrome: A condition that makes you feel like you need to move your legs.
  • Sleep apnea: Short pauses in your breathing while you sleep. This is rarely caused by cancer or treatment. But if you have sleep apnea, it needs to be treated to prevent other problems.

For some people, these sleep problems are short-term. They may only last for 3 months or less. For other people, these problems might last several months or years. Sleep problems can also come and go. They may get worse or last longer when you are upset or having side effects from your treatment.

If you have insomnia, you might:

  • Have trouble falling asleep.
  • Wake up at night and have trouble going back to sleep.

Insomnia can be short-term and last only for a single night, a few days, or a few weeks. It can also last longer and become chronic. This means it lasts for 3 months or longer and happens at least 3 nights of the week.

Insomnia when you have cancer

Most adults need at least 7 hours of sleep each night. Insomnia can prevent you from getting the amount of sleep you need. This can lead to a physical, emotional, and mental feeling of tiredness called fatigue. It can also cause you to feel sleepy during the day, making it harder to do your usual daily activities.

If you already have exhaustion or fatigue from your cancer or treatment, insomnia can make these problems worse. Your care team can help you find ways to manage this.

What if I had insomnia before my cancer diagnosis?

If you had insomnia before your cancer diagnosis, you are more likely to continue having trouble sleeping. You might need new ways to manage your sleep problems.

People with hypersomnia feel very sleepy during the day. You might also sleep for longer than usual at night.

Signs of hypersomnia include:

  • Sleeping for 9 or more hours at a time
  • Longer periods of deep sleep than usual
  • Sleepiness that doesn’t get better after a nap or a night of sleep

Hypersomnia can make it hard to take care of your family, home, and work duties. Because you are so sleepy, you may find it difficult to do activities you normally enjoy.

Hypersomnia and cancer-related fatigue

Hypersomnia is similar to fatigue, but it’s not the same thing. Hypersomnia is the feeling of being too sleepy during the day. It also includes sleeping for a long time at night. Fatigue is a lack of energy that does not get better after you sleep.

Some people have both hypersomnia and cancer-related fatigue. It can sometimes be hard to tell the difference. Talk to your healthcare team if you are worried about either of these problems. They can help you find ways to manage.

Restless legs syndrome (RLS) makes you feel like you need to move your legs. It can come with creeping, crawling, or itching feelings. When you’re trying to rest or sleep, these feelings cause jerking movements that keep you awake.

RLS often gets better when you move. Walking or stretching can help lower the urge to move your legs. RLS usually happens more during the evening hours.

RLS when you have cancer

Anyone can get RLS, but it could also be related to your cancer or treatment:

  • Some people get RLS during chemotherapy (chemo).
  • Low iron can also cause RLS or make it worse.

Talk to your cancer care team if you have signs of RLS.

Sleep apnea is short pauses in your breathing while you sleep. Each pause can last as long as 10 seconds and can happen many times in one night. Many people with sleep apnea snore and wake up during the night. It can prevent restful sleep and make you feel tired or sleepy during the day.

Sleep apnea when you have cancer

Some cancers, like those in the head and neck, can raise the risk of sleep apnea. But cancer and its treatment do not usually cause this sleep problem. Many people with cancer have sleep apnea for other reasons.

If you have sleep apnea, it’s important to keep up with the treatment you are already getting. It’s also important to let your cancer care team know if you have sleep apnea.

What causes these sleep problems?

Many things can cause sleep problems when you have cancer. Some of these problems might be caused or made worse by your treatment, side effects, or the cancer itself. Other factors like your stress level, home and work life, lifestyle habits, and age can also affect your sleep.

It isn’t always easy to tell if a sleep problem is related to cancer or caused by something else in your life. But no matter the cause, tell your cancer care team if you are having trouble sleeping or if your sleep habits change over time. They can help you manage these problems.

Cancer and cancer treatment

Sleep problems can be caused or made worse by:

  • Having a tumor in your brain
  • Certain cancer treatments, including some surgeries, radiation therapy, and chemo
  • Steroid medicines
  • Other medicines used to manage your cancer, side effects, or other conditions

Certain side effects

Many side effects of cancer and treatment can cause you to wake up during the night and make it harder for you to fall asleep, including:

Mental health and coping struggles

Having cancer can bring up many strong feelings and emotions. You may feel worried, stressed, afraid, or sad. These emotions are common in people with cancer. They can also cause sleep problems.

You can learn more about coping with these mood changes in Mental Health and Distress.

Symptoms of sleep problems

People with cancer and sleep problems often say that they:

  • Feel more tired than usual during the day
  • Feel a need to rest or sleep more (fatigue)
  • Have trouble falling asleep or staying asleep (insomnia)
  • Get too much sleep but still feel tired (hypersomnia)
  • Have trouble thinking or focusing
  • Don’t function as well during the day
  • Feel upset or worried about getting good sleep
  • Have a lower quality of life

How are sleep problems treated?

Sleep problems can be very different for each person. Start by describing your symptoms to your healthcare team. This helps them figure out the best way to treat your problem. Your care team might refer you to a sleep specialist to help you figure out why you’re having trouble.

Below are some common ways to treat cancer-related sleep problems. You might need to use more than one.

Cognitive behavioral therapy for insomnia (CBT-I)

The best-proven treatment for sleep problems is a type of talk therapy called cognitive behavioral therapy for insomnia (CBT-I). It is one way to help you feel less anxious about sleep without medicine.

Thinking or worrying about sleeping can make your sleep problems worse. The goal of CBT-I is to build better sleep habits and calm worrying thoughts about sleep. You’ll learn to keep a daily routine, sleep only in your bed, and relax your body and mind before bedtime.

Ask your cancer care team how to find a therapist trained in CBT-I, near you or online.

Mindfulness, meditation, and relaxation

There are many ways to relax, calm your thinking, and wind down before bed. Relaxation methods can help you fall asleep, stay asleep, and go back to sleep if you wake up during the night.

Some examples include focused breathing, meditation, mindfulness, progressive muscle relaxation, music therapy, hypnosis, and guided imagery.

You might be able to learn some of these methods on your own. But if you’d like help, ask your cancer care team for resources or a referral to a sleep specialist.

Sleep medicines

Medicine can sometimes help with sleep. Most often, doctors prescribe medicines when CBT-I and changes to sleep habits are not enough. Your healthcare team can help you decide if this is right for you.

Sleep medicines can have risks, such as sleepiness the next day, falls, or memory problems. These risks can be higher for older adults. Because of this, some sleep medicines are only meant for short-term use.

Managing your other medicines

Some types of medicine can make sleep problems worse. This includes steroids, hormones, and some medicines for pain, seizures, anxiety, and depression.

Don’t change or stop any of your medicines without talking to your healthcare team first. Tell them about any medicines you are taking or plan to take.

Treating side effects that cause sleep problems

Some side effects from cancer or treatment can cause sleep problems. Poor sleep and these side effects often feed into each other.

When side effects keep you up at night, you may feel more tired, sad, or sore the next day. Those feelings can make it even harder to sleep the next night. Treating the side effects can often stop the cycle and improve your sleep.

How can I manage my sleep problems?

There are many things you can do to help manage your sleep problems:

Good habits before bedtime can help you sleep. This practice is often called sleep hygiene. You can improve your sleep hygiene if you:

  • Keep a schedule. Try to go to sleep and get up at the same time each day.
  • Have a relaxing bedtime routine. This includes activities like a bath, reading, meditation, calm music, or breathing exercises.
  • Try a sleep or meditation app. Ask your care team which apps would be most helpful for you.
  • Avoid screens. Don't watch TV or use screens in bed. Avoid looking at screens for at least 30-60 minutes before you go to sleep.
  • Get a backrub or foot massage. Ask your partner or caregiver for a gentle backrub or foot massage near bedtime.
  • Keep the clock out of sight. Try not to look at the clock when you are awake at night.

If you can’t fall asleep within about 20 minutes, or if you wake up and can’t go back to sleep, it’s time to try something new. Get up and go to a different part of your home. Stay in a darkened room and do something relaxing, like reading a book. Don’t go back to bed until you feel sleepy again.

What you eat and drink before bed can also affect your sleep.

  • Avoid big evening meals. Try not to eat a big meal or drink a lot of liquids before bed.
  • Stick to light snacks. If you need to eat before bed, have a light snack with some protein, like cheese or peanut butter.
  • Try a warm drink. Warm, caffeine-free drinks like heated milk or decaf tea might help you relax.

  • Manage lights, noise, and temperature. If possible, keep your room dark, quiet, and at a comfortable temperature.
  • Wear comfortable clothes. Loose, comfortable clothing can sometimes help you sleep.
  • Think about your bedding. Keep your bedding clean. Use pillows and blankets to make yourself as comfortable as possible.
  • Only use your bed for sleeping and sex.

What you do during the day can make a big difference in how you sleep at night.

  • Get sunlight in the morning. Try to spend time in bright daylight early in the morning.
  • Avoid caffeine after midafternoon. You can also try cutting back on caffeine or not drinking it at all.
  • Avoid tobacco, nicotine, and alcohol. Avoid them near bedtime or avoid completely.
  • Set your to-do list aside. If worry or anxiety makes it hard to sleep, try writing a to-do list before bed and then putting it away for the night.
  • Schedule a “worry time.” Make a set time to worry earlier in the day.
  • Avoid daytime naps. If you need to nap, keep it to 30 minutes or less. Try to take only one nap per day.
  • Get physical activity every day. It’s best to do this in the morning or afternoon.
  • Avoid exercise close to bedtime. Try not to exercise within 3 hours of bedtime.
  • Stretch daily. If you have RLS, daily stretching exercises might relax your muscles.

Ask your cancer care team if you need help finding an exercise or stretching routine. They can also refer you to a physical therapist to learn stretches that relax your muscles.

Sometimes it helps to keep track of your sleep habits so you can figure out patterns and problems.

  • Keep a sleep diary. Record the times you sleep and wake up, including naps.
  • Write down what works and doesn’t work. Write down anything that keeps you from falling or staying asleep, like side effects or worries. Also record anything that helps you sleep better.
  • Ask your partner for clues. If you have a partner, ask them if they notice anything unusual when you are asleep.

When to call your care team

Most sleep problems are treatable. Call your healthcare team if you:

  • Sleep very little or can’t sleep at all most nights
  • Have trouble sleeping that lasts 3 months or more
  • Feel sleepy or doze off during the day
  • Have been told you snore loudly or stop breathing while you sleep
  • Feel a strong urge to move your legs at night
  • Feel that poor sleep is hurting your mood, daily life, or ability to function

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Developed by the American Cancer Society medical and editorial content team with medical review and contribution by the American Society of Clinical Oncology (ASCO).

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Last Revised: October 14, 2026

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