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Best Adjustable Beds For Sleep Apnea (2024 Update)

If you're looking for a comfortable and effective sleep solution to battle sleep apnea, an adjustable bed may be what you need. Adjustable beds are designed to provide a personalized sleep experience that suits your body's unique needs. They allow you to elevate your head and feet, adjust the firmness, and more, all at your fingertips. But before buying one, there are some factors you should consider.

First and foremost, you need to consult with a healthcare professional. They can recommend the right bed features and adjustments that will help you alleviate your sleep apnea symptoms. Additionally, think about the bed's size, comfort, ease of use, and the material quality. It's also essential to ensure the bed is designed to help prevent snoring and to promote relaxation.

Are you constantly tired and waking up with a headache? Do you have trouble concentrating or suffer from mood swings? If yes, you may be suffering from sleep apnea and may need an adjustable bed. It's crucial to get a good night's sleep to keep your body and mind healthy. Investing in the right adjustable bed can significantly improve your sleep experience. Don't wait too long; improve your sleep quality today by considering the best adjustable beds for sleep apnea.

10 Best Adjustable Beds For Sleep Apnea

# Product Image Product Name Product Notes Check Price
1
This product is ideal for those looking for an adjustable bed frame with USB ports, wireless remote, and quiet motor.
2
This product is ideal for those seeking customizable comfort in bed with features like lumbar support and massage capabilities.
3
The product is ideal for reducing neck and back pain, snoring, acid reflux, respiratory problems, and providing comfortable sleeping, reading or resting position.
4
It is an ideal pillow for those who suffer from acid reflux, heartburn, GERD and snoring during sleep.
5
This product is ideal for providing relief from acid reflux, snoring, and post-surgery discomfort with its memory foam top and bamboo cover.
6
The product is ideal for side sleepers using CPAP machines to reduce air leaks and mask pressure for better sleep.
7
This product is ideal for people seeking an adjustable bed with advanced features such as massage, zero gravity, and wall hugger.
8
The product is ideal for those looking for an adjustable bed base with various positions, wireless remote control, and safety features.
9
The product is ideal for providing support and comfort to the back, shoulder, neck, and knees while sleeping.
10
The product is ideal for individuals experiencing acid reflux, post-surgery discomfort, heartburn, snoring, and those who need elevated sleeping positions.
This product is ideal for those looking for an adjustable bed frame with USB ports, wireless remote, and quiet motor.
This product is ideal for those seeking customizable comfort in bed with features like lumbar support and massage capabilities.
The product is ideal for reducing neck and back pain, snoring, acid reflux, respiratory problems, and providing comfortable sleeping, reading or resting position.
It is an ideal pillow for those who suffer from acid reflux, heartburn, GERD and snoring during sleep.
This product is ideal for providing relief from acid reflux, snoring, and post-surgery discomfort with its memory foam top and bamboo cover.
The product is ideal for side sleepers using CPAP machines to reduce air leaks and mask pressure for better sleep.
This product is ideal for people seeking an adjustable bed with advanced features such as massage, zero gravity, and wall hugger.
The product is ideal for those looking for an adjustable bed base with various positions, wireless remote control, and safety features.
The product is ideal for providing support and comfort to the back, shoulder, neck, and knees while sleeping.
The product is ideal for individuals experiencing acid reflux, post-surgery discomfort, heartburn, snoring, and those who need elevated sleeping positions.

1. Lucid Full Bed: Fully Adjustable With Wireless Control

The Bed Frame with Wireless Remote is the perfect investment for anyone looking to add comfort and convenience to their sleeping experience. This adjustable bed frame comes equipped with head and foot incline features, a memory position setting, and a remote flashlight, all controlled by a handy wireless remote control.

Designed with your comfort in mind, this bed frame includes a USB charge port, allowing you to easily charge your devices while you relax in bed. With its easy assembly process, you can have your bed frame set up and ready to use in less than five minutes.

This bed frame is also versatile and compatible with any bed frame, mattress under 14 inches, and any Lucid mattress. The bed frame is made to last with a 750-pound weight capacity for Queen beds and 500 for Twin XLs, ensuring durability and longevity.

Investing in the Bed Frame with Wireless Remote is an excellent decision for those who prioritize comfort, convenience, and durability in their sleeping experience. Whether you're looking to add extra comfort to your existing mattress or upgrade to a new one, this adjustable bed frame is the perfect fit.

2. Platinum Adjust – Luxe Bed, Massage, Usb, Wireless – Twin Xl

Introducing the Adjustable Bed Frame by Sven and Son, the #1 rated premium adjustable base that is designed to provide optimal comfort and support for a good night's sleep. This bed frame features lumbar support and pillow tilt, head 0-75° foot articulation 0-45°, and wall hugging 8 inches, all powered by four independent heavy-duty motors with a 900 lb. lift capacity. The headboard is not included, giving you the freedom to choose your own style.

The ergonomic remote offers a variety of features, including zero gravity, anti-snore, TV, three pre-set memory buttons, flashlight, individual lumbar and head tilt, under-bed LED lighting, and wireless raised button and 1 backlit remote. With the interactive massage units, you can enjoy multiple level massage, pulse, wave, and full body vibration. The bed frame is also compatible with storage beds and platforms, and has a zero clearance design with an emergency power-down feature, dual USB charging stations (four per base), and a mattress retention bar system. The adjustable legs come in 3", 6", and 9" sizes, so you can customize the height to your liking.

The Adjustable Bed Frame by Sven and Son also comes with a free 10-year extended warranty ($600 retail value) with $0 deductible parts and labor in-home technician visits. This warranty covers 100% mechanical, motors, electric, power surges, and structural coverage, making it one of the best coverage options available.

As an added bonus, the Sleep System also includes one Twin XL 12" Luxury Cool Gel Bionic-Infused Memory Foam Mattress with a medium feel. The bionic cool gel-infused memory foam supports your full body, eliminating pressure points on your shoulders and hips while whisking away unwanted heat as you sleep.

3. Comfort+ Bed Wedge Pillow: Reduce Pain & Snoring.

The ultimate relaxation and recreation can now be achieved with the Bed Wedge Pillow. This pillow is designed to elevate your head or recline comfortably for instant relief, ensuring you have a good night's sleep. The back wedge pillow has a layer of high-density memory foam, which maximizes comfort and fits your body's shape, making it perfect for enhanced sleep.

Not only does this pillow provide comfort, but it also improves your health. Sleeping at an inclined angle with a mattress wedge has been known to reduce snoring, relieve neck/back pain, acid reflux, allergies, breathing issues, release pressure on the upper back muscles, and more. This is an ideal sleeping wedge for your well-being.

The Bed Wedge Pillow is made with premium-quality high-density foam and measures 22" x 22" x 7.5". It is free from toxic substances, will not be harsh against your skin, and doesn't get heated like other memory foam pillows. The pillow is protected with a highly breathable, removable cover which can be washed and is sure to last for many years of use.

This versatile incline pillow serves as an elevated pillow for sleeping and can also be used as a supporting cushion while watching TV/reading your favorite book/magazines, during pregnancy/post-surgery pillow, and even for raising your legs.

The company's number one priority is customer satisfaction. They go the extra mile to please their customers by providing only the best in comfort, quality, and customer care. The Bed Wedge Pillow is covered by a 100% money-back guarantee, 60-night trial for a full refund, and a 2-year warranty. With this product, you can rest assured that you are getting a high-quality, versatile, and comfortable pillow that will improve your health and well-being.

4. Sleepbolster With Memory Foam For Acid Reflux

The Kӧlbs Wedge Pillow is a versatile and comfortable solution for those who suffer from GERD, heartburn, acid reflux, snoring, neck and back pain, sleep apnea or post-surgery ailments. Available in two height options, 7.5 inches or 12 inches, this particular option features a 7.5-inch incline.

The Kӧlbs Wedge Pillow is designed with both comfort and style in mind. Its removable jacquard pillow case adds a touch of luxury to your bedroom while also protecting the incline pillow from stains. The cover is machine washable and can be easily removed from the triangle pillow core.

The upper layer of the pillow wedge is made of a plush 1.5-inch memory foam, providing a comfortable and relaxing night’s sleep. The memory foam sits on top of a high-density medical-grade foam wedge core, which ensures the right firmness and proper support.

The Kӧlbs Wedge Pillow is an ideal solution for those with medical conditions that rob them of a good night’s sleep. It supports head, foot or leg elevation, making it the perfect wedge pillow for sleeping, snoring, or sleep apnea.

5. Intevision Bed Wedge: Ultimate Sleep Support Solution.

Introducing the latest version of the wedge pillow system that aims to provide the ultimate comfort for a good night's sleep. This two-layer design is made of high-quality materials featuring a 2-inch cooling gel memory foam layer on top of a firm base foam. Additionally, it includes a height-adjustable cooling gel memory foam headrest to provide optimal support for the neck and head. The result is the most comfortable wedge pillow system available in the market.

This U.S. patented wedge pillow system is designed to help individuals who are suffering from acid reflux, snoring, allergies, or any other condition that impairs breathing in a supine position. It can also be used by those who have been recommended by a health professional to sleep in an elevated position after surgery. Moreover, it helps alleviate back pain and promotes a healthy and comfortable night's sleep.

The wedge pillow system comes with a machine-washable, high-quality bamboo cover that measures 26" x 25" x 7.5". For those who want extra pillowcases, an optional 400 thread count, 100% Egyptian cotton pillowcase is now available on Amazon (sold separately).

Investing in this wedge pillow system guarantees a good night's sleep with its unique features and benefits. Say goodbye to uncomfortable sleeping positions and wake up feeling refreshed and rejuvenated every morning.

6. Sleepbetter Cpap Pillow With 2 Cases

The C Pap Pillow by Lunderg is a comfortable and innovative solution for all types of sleepers. Whether you prefer sleeping on your side, back, or stomach, this pillow has been designed to provide absolute comfort to your head and neck. With two sides and two levels of thickness, you can choose the perfect fit for your sleeping needs.

Unlike other cpap pillows for side sleepers full mask that come with no pillow cover or only one, Lunderg has included two pillowcases for your absolute convenience. The standard premium-comfort case comes with the pillow while a cooling-fabric case is included in the box. You won't have to use a regular pillow while the case is washing.

One of the best features of this pillow is its adjustable thickness. Lunderg understands that no two people are alike, so they have included an extra layer of memory foam to adjust the height of your contour pillow. This feature ensures that you have a customized fit that is perfect for you.

If you're looking for the perfect gift for your spouse or partner, the C Pap Pillow by Lunderg is a great choice. It works perfectly with nasal, full face or any kind of mask, making it a versatile product that will provide relief and comfort to your loved ones.

Lunderg is confident about the efficacy of their product. If for any reason the face pillow doesn't reduce air leaks, mask pressure, or improve your quality of sleep, the company offers a full refund. You can buy with complete confidence and rest assured that you're getting a quality product.

Lastly, Lunderg products are FSA/HSA eligible, which means you can save up to 30% by using pre-tax dollars to pay for eligible FSA/HSA expenses for yourself, your spouse, and qualifying children or relatives. This feature makes the C Pap Pillow by Lunderg a cost-effective solution for your health needs.

7. 5d Adjustable Bed Base, Wireless, Hd Massage, Wall Hugger, Zero Gravity, Split King

Looking for the ultimate sleep experience? Look no further than this incredible power lift bed frame. With head and foot articulation, a whisper quiet lift system, and wallsnuggler design, this bed is perfect for anyone looking to get the most out of their sleep.

The bed features powerful 850 lb. capacity power lift motors that ensure a smooth and stable lift every time. The four corner retainer bar is designed to keep any mattress in place, so you don't have to worry about slipping or sliding during the night.

The bed also comes with a wireless back-lit remote that allows you to easily adjust the bed to your desired position. The remote also includes pre-programmed zero-gravity, anti-snore, and flat positions for your convenience.

Experience the ultimate relaxation with the 3d wave technology that provides a better massage with ten intensity levels. The 3 in 1 leg height kit allows you to adjust the height of the bed to 3", 5", or 8", so you can find the perfect height for your needs.

The bed also features a back up battery power-down feature, ensuring that you can always adjust your bed even in the event of a power outage. Plus, it fits inside any existing bed frame, so you don't have to worry about buying a new frame.

With a 20 year manufacturer warranty, you can trust that this power lift bed frame is built to last. Don't settle for a mediocre sleep experience – upgrade to this amazing bed today!

8. Silverlite Adjustable Bed With Wireless Remote

The COSMO Austin adjustable bed base is the perfect combination of style, comfort, and safety. With a beautiful, sleek, and functional design, this model is a customer favorite and has a nearly perfect 5-star rating. The bed is solidly built and incredibly comfortable, ensuring that you get a good night's sleep every night.

One of the key features of this bed is the easy-to-use wireless remote control that offers full control without any cables. The remote allows you to move the bed to our specially pre-set ergonomic memory positions or save your own settings for customized comfort. With full adjustability, head-up/foot-up motions, a pre-set flat position button, child lock, free-fall design, emergency lowering functions, night mode, and more, you will have complete control over your sleeping experience.

The wireless remote control also includes a built-in child lock for added safety. You can choose from pre-defined ergonomic memory positions such as anti-snore and zero gravity or program your personal preferences.

The COSMO Austin adjustable bed base is incredibly easy to set up. You can set it up from the box to the bed in just 10 minutes, with no tools needed and no flipping of the frame. Unlike competitor products that require assembly with the bed upside down, requiring you to flip a heavy fully-assembled frame upright, COSMO Austin assembles upright in minutes. One person can easily assemble the bed alone.

To ensure stability, the base has been designed to function perfectly with up to 900 pounds of load, making it one of the most stable and safe adjustable bed frames on the market. The COSMO Austin adjustable bed base has been extensively safety tested and quality engineered to ensure extra peace of mind. The bed comes with a 10-year limited warranty and 100% U.S. based customer service. It is UL-962 certified, ensuring that it meets the highest safety standards.

9. Sleep Support Wedge: Multipurpose Memory Foam Pillow

The Wedge Pillow is the ultimate support solution for those seeking extra comfort and assistance while sleeping. This multi-purpose pillow offers customized support for various parts of the body including the head, neck, back, and legs. It features a 30 or 60-degree elevation cushion, made with high-density memory foam, that provides unparalleled support wherever you need it most.

Designed for maximum convenience, this wedge pillow is a great snoring aid that elevates the upper body, promoting snoring reduction and enabling a peaceful night's sleep. Equally important, the 30-degree design makes it easy to store the pillow away when not in use.

Cleaning this pillow is a breeze as well. The zippered cover can be removed and thrown in the washing machine for a quick and easy clean. No more complicated cleaning instructions to keep you up at night.

Whether you're recovering from an injury, suffering from acid reflux, or just looking for a comfortable sleeping solution, this wedge pillow is the perfect choice. The high-density memory foam ensures maximum comfort, while the multi-purpose design provides support and elevation wherever you need it most.

In addition to its many benefits, this wedge pillow is also ideal for reading, watching TV, or working on your laptop in bed. It offers a comfortable and supportive surface that helps alleviate pressure and stress on the body.

10. Luxury Wedge Pillow For Better Sleep And Health.

Introducing the new wedge memory foam pillow, designed with customer feedback in mind. This pillow boasts a unique combination of 5.5” of base foam and 2” of luxurious memory foam topper that provides optimal neck and body support, ensuring you a good night’s sleep. This product offers the perfect blend of comfort and support, all for a very reasonable price.

The pillow comes with a removable cooling bamboo cover that promotes air circulation throughout the night, which in turn keeps you cool and comfortable. The cooling feature makes this pillow a great option for those who suffer from night sweats or hot flashes.

This wedge support pillow is a versatile product that can be used to alleviate various health issues such as heartburn, acid reflux, or back and neck pain. Customers can pair it with their favorite shredded memory foam pillow to experience even better circulation, less sickness, and an overall better sleep. The pillow is designed to provide top-notch comfort and support, and its quality is guaranteed.

You deserve a good night’s sleep without any pain or discomfort when you wake up. Don’t settle for anything less than the best. This large foam wedge pillow is the perfect solution to all your sleep needs. It is made with high-quality materials that provide the ultimate comfort and support, unlike other wedge pillows on the market. Invest in this pillow today and experience a good night’s sleep like never before.

Best Adjustable Beds For Sleep Apnea FAQs

Are there any adjustable beds specifically designed for sleep apnea sufferers?

Yes, there are adjustable beds that are specifically designed to provide relief to sleep apnea sufferers. These beds are equipped with features that can help alleviate the symptoms of sleep apnea and improve the quality of sleep.

One of the most common features of adjustable beds for sleep apnea sufferers is the ability to elevate the upper body. This position can help keep the airways open, reducing the occurrence of apneas and snoring. Additionally, some adjustable beds have massage functions that can help relax the muscles and reduce tension in the body, which can also help with breathing.

When looking for an adjustable bed for sleep apnea, it is important to consider the specific needs of the individual. Some may prefer a firmer or softer mattress, while others may need additional support in the lumbar region. It is also important to choose a bed that is durable and reliable, as well as easy to use.

Overall, adjustable beds can be a great option for sleep apnea sufferers, as they offer customizable support and comfort that can help improve sleep quality and overall health.

Can an adjustable bed help alleviate symptoms of sleep apnea, such as morning headaches and fatigue?

Yes, an adjustable bed can help alleviate symptoms of sleep apnea, such as morning headaches and fatigue. Sleeping on an adjustable bed allows you to elevate your head and upper body, which can help to keep your airway open. By keeping your airway open, you can reduce the symptoms of sleep apnea and improve your quality of sleep. Additionally, an adjustable bed can help to alleviate pressure points and promote better circulation, which can further improve your sleep quality and reduce the risk of developing other health problems. However, it is important to note that an adjustable bed should not be used as a substitute for medical treatment for sleep apnea. If you suspect that you have sleep apnea, it is important to speak with a healthcare professional to determine the best treatment plan for your individual needs.

Can an adjustable bed help reduce snoring associated with sleep apnea?

Yes, an adjustable bed can help reduce snoring associated with sleep apnea. Sleep apnea is a condition where the airway is partially or completely blocked during sleep, leading to disruptions in breathing and loud snoring. An adjustable bed can elevate the head and upper body, which can help to open up the airways and reduce snoring. By sleeping in an elevated position, the weight of the neck and chest is relieved, allowing the air to flow more freely. Additionally, an adjustable bed can help alleviate other symptoms of sleep apnea such as acid reflux, which can contribute to snoring. It is important to note that while an adjustable bed can be helpful, it is not a substitute for medical treatment for sleep apnea. If you suspect you have sleep apnea, it is important to speak with a healthcare professional to receive a proper diagnosis and treatment plan.

Do adjustable beds for sleep apnea come with any special sleep tracking features?

Yes, some adjustable beds for sleep apnea come with special sleep tracking features. These features may include sensors that track your heart rate, breathing patterns, and movement during the night. Some adjustable beds may also come with a companion app that allows you to track your sleep patterns over time and make adjustments to your sleeping position or settings on the bed to improve your sleep quality.

Additionally, some adjustable beds may come with built-in snore detection technology that can adjust the bed's position automatically to alleviate snoring and improve breathing. These features can be particularly beneficial for those with sleep apnea, as they can help identify potential issues and allow for adjustments to be made to improve sleep quality and overall health.

However, not all adjustable beds for sleep apnea come with these features, so it's important to do your research and choose a bed that meets your specific needs and preferences.

How do adjustable beds help with sleep apnea?

Adjustable beds are known to be beneficial for people with sleep apnea as they can help alleviate symptoms and improve overall quality of sleep. Sleep apnea is a condition where breathing repeatedly stops and starts during sleep, leading to fatigue, drowsiness, and other health complications.

Adjustable beds can be adjusted to different angles, elevating the head and upper body, which can help reduce the frequency of apnea episodes. Elevating the head and upper body can help keep the airway open and reduce snoring, which is a common symptom of sleep apnea. By reducing snoring and keeping the airway open, adjustable beds can help people with sleep apnea breathe easier and get a more restful sleep.

Moreover, adjustable beds can also help alleviate other sleep apnea symptoms, such as acid reflux and heartburn, which can further improve sleep quality. Overall, adjustable beds are a practical and effective solution for people with sleep apnea, providing a comfortable and customizable sleep environment that can help improve their overall health and well-being.

How do I choose the right adjustable bed size for my sleep apnea needs?

When selecting an adjustable bed for sleep apnea, it's important to consider the size of your mattress and bed frame. Your mattress should be able to fit comfortably on the adjustable base, with enough space to adjust the bed's position without causing any discomfort.

The size of the adjustable bed should also be appropriate for your height and weight. Generally, a twin or twin XL size bed is suitable for individuals up to 6 feet tall, while a full or queen size bed is better for taller individuals or couples who want more space.

Additionally, consider the features of the adjustable bed that will benefit your sleep apnea. For example, a bed with a head tilt feature can help reduce snoring and alleviate sleep apnea symptoms by raising the head and opening the airway.

Overall, it's important to choose an adjustable bed that fits your specific sleep needs and preferences. It's recommended to consult with a sleep specialist or healthcare professional to determine which bed size and features are best suited for your sleep apnea.

What are the benefits of using an adjustable bed for sleep apnea compared to a traditional bed?

Adjustable beds can provide several benefits to individuals with sleep apnea when compared to traditional beds. Firstly, adjustable beds can allow individuals to elevate their upper body and head while sleeping, which can help to keep the airway open and reduce snoring. This can be particularly beneficial for those with obstructive sleep apnea, where the airway becomes partially or completely blocked during sleep.

Secondly, adjustable beds can also help to alleviate pressure points and improve circulation, which can reduce discomfort and improve overall sleep quality. This is especially important for individuals with sleep apnea, who may already experience disrupted sleep due to breathing difficulties.

Lastly, adjustable beds can also provide added convenience and comfort for individuals with sleep apnea. Many adjustable beds come with features such as massage functions, USB charging ports, and remote controls, making it easier to adjust the bed position and find a comfortable sleeping position.

Overall, an adjustable bed can be a valuable investment for individuals with sleep apnea, providing both health benefits and added comfort. However, it is important to consult with a healthcare professional before making any significant changes to your sleeping arrangements.

What are the best adjustable beds for people with sleep apnea?

Sleep apnea is a common sleep disorder that affects a large number of people worldwide. Adjustable beds can be a great option for people with sleep apnea as they can help alleviate symptoms and provide a more comfortable sleeping environment. Here are some of the best adjustable beds for people with sleep apnea:

1. Sleep Number 360 Smart Bed: This bed adjusts to your preferred sleeping position and provides customized support to your head and neck, which can help alleviate sleep apnea symptoms.

2. Leggett & Platt Prodigy 2.0 Adjustable Bed: This bed comes with a pillow tilt feature that can help reduce snoring and improve breathing during sleep.

3. Reverie 9T Adjustable Bed: This bed comes with a lumbar support feature that can help alleviate pressure on the lower back and improve breathing during sleep.

4. Craftmatic Legacy Adjustable Bed: This bed comes with a massage feature that can help relax muscles and improve breathing during sleep.

It is important to consult with a healthcare professional to determine the best treatment plan for sleep apnea, but an adjustable bed can be a great addition to a sleep apnea management plan.

What features should I look for in an adjustable bed for sleep apnea?

If you are looking for an adjustable bed to alleviate sleep apnea, there are certain features that you should consider before making your purchase. Firstly, the bed should have an adjustable incline feature that can elevate the upper body to a certain degree, as this helps to keep the airways open and reduce snoring. Additionally, the bed should have a quiet motor for adjusting the incline, so as not to disturb your sleep.

Another important feature to consider is the mattress type. A memory foam mattress is often recommended for sleep apnea sufferers, as it molds to the body and provides pressure relief, which can reduce tossing and turning during the night. It is also important to choose a bed that has a sturdy frame and a weight capacity that can accommodate your body weight.

Lastly, you may want to consider a bed that has additional features such as built-in massage options or USB ports for charging devices. Ultimately, the right adjustable bed for sleep apnea will depend on your individual needs and preferences, so it is important to do your research and choose a bed that meets all of your requirements.

What is the best mattress to use with an adjustable bed for sleep apnea?

When it comes to choosing a mattress for an adjustable bed for sleep apnea, there are a few factors to consider. Firstly, it is important to choose a mattress that is compatible with the adjustable bed frame and can flex and bend with the frame without getting damaged. Secondly, the mattress should provide adequate support and comfort to alleviate the symptoms of sleep apnea.

Memory foam mattresses are often recommended for sleep apnea sufferers as they contour to the body's shape and provide pressure relief, which can help reduce snoring and improve breathing during sleep. Latex mattresses are also a good option as they are naturally hypoallergenic and breathable, which can be beneficial for those with sleep apnea.

It is recommended to consult with a healthcare professional or a sleep specialist for personalized recommendations on the best mattress for your specific needs and sleep preferences. Additionally, it is important to invest in a high-quality adjustable bed frame that allows for customized positioning to further alleviate symptoms of sleep apnea.