Find the Perfect Mattress: Expert Tips for Better Sleep and Comfort

Take our mattress quiz to find the perfect mattress for you. Get tailored recommendations based on your sleep position, budget, and comfort level. Learn about different mattress types and support layers. Trust our expert-approved recommendations for quality. Enjoy exclusive discounts and improve your sleep today!

Consider the material of the mattress as well. Memory foam offers great contouring and pressure relief, while innerspring mattresses provide more bounce and airflow. Hybrid mattresses combine both types, catering to diverse preferences.

Another crucial aspect is mattress size. A larger mattress gives you more room to move, promoting comfortable sleep. Additionally, check for price and warranty options. A good warranty can ensure long-term satisfaction.

Test the mattress in-store if possible. Lay down for at least 10 minutes to gauge comfort and support levels.

With these tips in mind, you can approach your mattress selection with confidence. In the next section, we will explore how the right bedding and sleep environment enhance your overall sleep experience.

Why is Choosing the Right Mattress Essential for Better Sleep and Comfort?

Choosing the right mattress is essential for better sleep and comfort because it directly impacts your overall health and well-being. A suitable mattress supports your body, aligns your spine, and reduces pressure points. This leads to improved sleep quality, helping you wake up feeling rested and rejuvenated.

According to the National Sleep Foundation, a mattress should promote proper alignment of the spine while providing adequate support to ensure a comfortable sleeping position. They emphasize that the right mattress plays a crucial role in achieving restorative sleep, which is vital for physical and mental health.

The underlying reasons why a suitable mattress is important include the following:

  1. Spinal Alignment: A mattress that provides adequate support helps maintain the natural curve of the spine during sleep. Poor alignment can lead to discomfort and pain.

  2. Pressure Relief: A good mattress distributes body weight evenly. This reduces pressure on joints and muscles, preventing discomfort and disturbances during the night.

  3. Personal Preferences: Individual preferences, such as firmness levels and sleeping positions (back, side, stomach), influence mattress choice. Meeting these preferences enhances overall comfort and satisfaction.

  4. Material Quality: The construction materials of a mattress, such as foam, innerspring, or latex, affect its durability, comfort, and support levels. Each material has distinct properties that cater to different needs.

Specific conditions that affect mattress choice include:

  • Chronic Pain: Individuals with back pain or arthritis may benefit from a medium-firm mattress that supports spinal alignment while allowing some sinkage to relieve pressure points.

  • Sleep Disorders: People with insomnia or sleep apnea might require a mattress designed for breathability and temperature regulation to promote deeper sleep.

  • Allergies: Hypoallergenic materials can help those with allergies by minimizing dust mites and other allergens in the sleeping environment.

In summary, selecting the right mattress is vital for achieving quality sleep and comfort. It influences spinal health, alleviates pressure, and caters to individual needs. Making an informed choice significantly affects sleep quality and overall well-being.

What Key Factors Should You Evaluate When Selecting a Mattress?

To select a mattress, you should evaluate several key factors that influence comfort and support. These factors ensure you choose a mattress that meets your specific sleep needs.

Key factors to evaluate when selecting a mattress include:

  1. Mattress Type
  2. Firmness Level
  3. Material Quality
  4. Size and Dimension
  5. Durability
  6. Temperature Regulation
  7. Motion Isolation
  8. Price and Warranty
  9. Return Policy and Trial Period

Understanding these factors can help you make an informed decision tailored to your preferences and requirements.

  1. Mattress Type:
    Mattress type refers to the different materials and construction techniques used in a mattress. Common types include innerspring, memory foam, latex, and hybrid mattresses. Each type has distinct benefits. Innerspring mattresses support weight efficiently, memory foam contours to the body for pressure relief, and latex offers natural breathability and durability. A 2020 survey from Mattress Advisor found that 29% of consumers prefer memory foam for its body contouring abilities.

  2. Firmness Level:
    Firmness level describes the mattress’s hardness or softness. It significantly affects comfort and spinal alignment. Ratings typically range from 1 (soft) to 10 (firm). Personal preference and sleeping position determine ideal firmness. Side sleepers usually prefer softer mattresses for cushioning, while back and stomach sleepers may benefit from firmer options. According to the National Sleep Foundation, nearly 60% of people report improved sleep quality when the mattress firmness matches their sleeping position.

  3. Material Quality:
    Material quality examines the components used in constructing a mattress. High-quality materials enhance durability, comfort, and support. Look for certifications like CertiPUR-US for foam products and organic labels for latex mattresses. Studies indicate that high-quality materials contribute to a longer lifespan and better sleep experiences. A 2019 study in Sleep Medicine Reviews highlighted that better mattress quality correlates with fewer sleep disturbances.

  4. Size and Dimension:
    Size and dimension involve selecting the right mattress size that fits your bed frame and accommodates your sleep style. Common sizes include twin, full, queen, and king. Your height, room dimensions, and whether you sleep alone or with a partner influence this choice. An inappropriate size can disrupt sleep quality. A study by the Better Sleep Council found that 55% of sleep partners report disturbances due to mattress size inadequacies.

  5. Durability:
    Durability refers to a mattress’s ability to withstand use over time without sagging or losing support. Durable mattresses provide long-term value. Natural latex options often exhibit higher durability due to their resilient nature compared to lower-quality foams. Research from Consumer Reports states that quality mattresses can last up to 10 years or more, making durability an essential consideration.

  6. Temperature Regulation:
    Temperature regulation relates to a mattress’s ability to maintain a comfortable sleeping temperature. Factors like foam density and the presence of cooling technologies contribute to temperature control. Memory foam, for example, may retain heat, while hybrid designs often incorporate cooling gels or breathable materials. The Sleep Foundation highlights that 30% of sleepers shift during the night due to temperature discomfort, emphasizing the importance of this factor.

  7. Motion Isolation:
    Motion isolation indicates how well a mattress absorbs movement and reduces disturbances. This factor is crucial for couples, as it minimizes the impact of one partner’s movements on the other side. Memory foam typically excels in motion isolation, while innerspring models may transfer movement more easily. A 2021 study published in Journal of Clinical Sleep Medicine found that mattresses with better motion isolation contributed to higher sleep satisfaction among couples.

  8. Price and Warranty:
    Price and warranty are essential factors when selecting a mattress. High-quality mattresses come at varying price points, and it is important to find one that fits your budget while offering value. A warranty guarantees the mattress against defects and usually ranges from 5 to 20 years. Consumer Reports states that a good warranty indicates manufacturer confidence in their product, giving buyers peace of mind about their investment.

  9. Return Policy and Trial Period:
    Return policy and trial period represent the terms under which a buyer can return the mattress if it does not meet their expectations. Many companies offer trial periods lasting from 30 to 120 nights. These policies allow consumers to test the mattress in their own home before making a final commitment. According to the Better Sleep Council, 80% of shoppers believe having a trial period factors significantly into their purchase decision.

By considering these factors, you can make an informed choice that leads to better sleep and overall well-being.

How Does Mattress Firmness Influence Your Sleep Quality?

Mattress firmness significantly influences your sleep quality. A mattress that is too firm can create pressure points, leading to discomfort. This discomfort may cause frequent awakenings and reduced sleep duration. Conversely, a mattress that is too soft can lack support, resulting in improper spinal alignment. Poor spinal alignment can lead to back pain and restless sleep.

To understand how mattress firmness affects sleep quality, consider these components: body weight, sleeping position, and personal preference. Heavier individuals often benefit from firmer mattresses, as they provide adequate support. Lighter individuals may prefer softer mattresses for comfort.

Sleeping position also plays a role. Side sleepers typically need softer mattresses to cushion their shoulders and hips. Back sleepers usually require medium-firm mattresses to support their spine. Stomach sleepers often need firmer mattresses to prevent their spine from sagging.

In summary, selecting the right mattress firmness is essential for optimal sleep quality. It must match your body weight, sleeping position, and personal comfort preferences. By choosing the appropriate firmness level, you can improve both comfort and overall sleep experience.

Which Mattress Materials Are Most Comfortable and Supportive?

The most comfortable and supportive mattress materials are memory foam, latex, innerspring, and hybrid. Each material has distinct attributes that cater to different sleeping preferences.

  1. Memory Foam
  2. Latex
  3. Innerspring
  4. Hybrid

These materials offer various levels of comfort and support, which depend on personal preferences and sleeping positions. Selecting the right mattress can be a subjective experience based on factors like body weight and sleeping habits.

  1. Memory Foam: Memory foam mattresses adapt to the body’s shape. They provide targeted support and pressure relief. The National Sleep Foundation highlights that memory foam can help reduce pain by distributing body weight evenly. A study by Rihman et al. (2021) from the Sleep Research Society showed that users reported better sleep quality when using memory foam due to its contouring properties. This type of mattress is ideal for side sleepers as it cushions the shoulders and hips.

  2. Latex: Latex mattresses are made from natural or synthetic rubber. They offer a bouncier feel compared to memory foam. According to the Consumer Product Safety Commission, latex is hypoallergenic and resistant to dust mites, making it suitable for allergy sufferers. Studies by the Global Organic Latex Standard (GOLS) indicate that natural latex supports spinal alignment while providing durability. This material appeals to eco-conscious consumers and those who prefer a responsive sleeping surface.

  3. Innerspring: Innerspring mattresses have coils that provide support and promote airflow. These mattresses typically have a firmer feel. A 2020 study by the Journal of Chiropractic Medicine found that users of innerspring mattresses reported lower back pain relief compared to other materials. Though they offer good support for back and stomach sleepers, innerspring mattresses may lack the contouring comfort preferred by side sleepers.

  4. Hybrid: Hybrid mattresses combine memory foam or latex with innerspring coils. This design aims to provide both support and comfort. A study by the Sleep Foundation in 2022 revealed that hybrid mattresses help balance the soft feel of foam with the sturdy support of coils. They are often recommended for couples with varying sleep preferences, as hybrids can accommodate both partners’ needs effectively.

Choosing the right mattress material involves understanding the specific attributes each type offers. By considering personal comfort and support needs, individuals can find a mattress that enhances their sleep experience.

What Is the Best Way to Test a Mattress Before Purchase?

Testing a mattress before purchase is crucial for ensuring comfort and support. The process involves lying down on the mattress to assess its feel and support level. This first-hand experience helps consumers determine if the mattress meets their individual sleeping preferences and needs.

The Better Sleep Council emphasizes the importance of testing a mattress in-store. They recommend lying on the mattress for at least 10 to 15 minutes to get a realistic feel for its comfort and support.

When testing a mattress, several aspects should be considered, including firmness, pressure relief, and alignment. Firmness reflects the mattress’s support level, while pressure relief determines how well the mattress conforms to the body’s shape. Proper spinal alignment ensures comfort and reduces pain during sleep.

According to the Sleep Foundation, firmness levels can vary from soft to firm, impacting overall sleep quality. Each sleeper’s preference for firmness can depend on their weight, sleeping position, and any existing health conditions.

Nearly 50-70 million adults in the U.S. experience sleep disorders, as stated by the Centers for Disease Control and Prevention (CDC). Inadequate mattress support can contribute to these issues, affecting health and emotional well-being.

Choosing the right mattress can enhance sleep quality, leading to improved health, productivity, and mood. A poor mattress can result in sleep deprivation, negatively impacting overall quality of life.

Experts recommend testing multiple mattresses and transitioning to sleep hygiene practices. Using a mattress cover and maintaining a consistent sleep schedule are practical steps to enhance sleep quality.

Additionally, technologies such as sleep trackers can provide insights into sleep patterns. Utilizing these tools can further improve sleep comfort and help individuals select the right mattress.

What Are the Different Types of Mattresses, and Which One Should You Choose?

The types of mattresses include innerspring, memory foam, latex, hybrid, and air beds. Each type offers unique features and benefits, making it essential to choose based on personal needs and preferences.

  1. Innerspring mattresses
  2. Memory foam mattresses
  3. Latex mattresses
  4. Hybrid mattresses
  5. Air beds

Choosing the right type of mattress depends on various factors, such as sleep position, comfort preference, budget, and health considerations. Now, let’s explore the details of each mattress type to help you make an informed decision.

  1. Innerspring Mattresses:
    Innerspring mattresses utilize a support system of steel coils. These coils provide bounce and sturdiness while allowing airflow. They feature layers of foam or padding on top for comfort. According to the Sleep Foundation, innerspring beds are popular for their affordability and availability. They suit those who prefer a firmer feel. However, they may not provide adequate pressure relief for side sleepers.

  2. Memory Foam Mattresses:
    Memory foam mattresses are known for their contouring properties. The foam molds to the body’s shape, providing support and relieving pressure points. This type of mattress absorbs movement, making it ideal for couples. A study by the National Sleep Foundation indicates that memory foam can significantly reduce discomfort due to its ability to distribute weight evenly. However, some users may find them hot, as they can retain body heat.

  3. Latex Mattresses:
    Latex mattresses are made from natural or synthetic rubber. They offer a responsive and bouncy feel while providing excellent support and durability. They are hypoallergenic and resistant to dust mites and mold. According to the Latex Allergy Resource Center, natural latex mattresses are particularly beneficial for allergy sufferers. Though they often come with a higher price tag, they are long-lasting and environmentally friendly.

  4. Hybrid Mattresses:
    Hybrid mattresses combine innerspring coils with foam or latex layers. This design aims to provide the best of both worlds: the support of coils and the comfort of foam. Research from Consumer Reports suggests that hybrid mattresses appeal to a broad range of sleepers. They suit various sleep positions and preferences. However, they can be heavier and more expensive than other types.

  5. Air Beds:
    Air beds feature adjustable air chambers, enabling users to customize firmness. They provide versatile comfort and support, making them suitable for different sleep preferences. According to a 2019 study by the Journal of Sleep Research, air beds can lead to better sleep satisfaction for couples, as each side can be tailored individually. However, they may require maintenance and can be less durable over time compared to traditional mattresses.

By understanding each type of mattress, you can choose one that aligns with your particular needs.

Which Type of Mattress Provides the Best Support for Back Pain?

The best mattress type for back pain typically offers medium to medium-firm support, balancing comfort and spinal alignment.

  1. Memory Foam Mattress
  2. Latex Mattress
  3. Innerspring Mattress
  4. Hybrid Mattress
  5. Adjustable Air Mattress

Finding the ideal mattress for back pain relief often involves evaluating different types and their unique features.

  1. Memory Foam Mattress:
    A memory foam mattress conforms to the body’s shape, providing targeted support for the spine. This material evenly distributes body weight, reducing pressure points. A study by the American Chiropractic Association in 2018 found that memory foam helps alleviate back pain for many users. Users often report improved sleep quality after switching to this mattress type.

  2. Latex Mattress:
    A latex mattress is made from natural or synthetic latex material, offering good support and resilience. It provides a bouncier feel than memory foam while still contouring to the body. A 2020 study published in the Journal of Pain Research demonstrated that latex mattresses significantly reduce back pain for individuals suffering from chronic discomfort. Their durability is another advantage, as they typically last longer than other mattress types.

  3. Innerspring Mattress:
    An innerspring mattress has a coil support system with varying firmness levels. It allows for good air circulation and maintains a traditional feel. However, some models may lack contouring support, which can be less effective for back pain relief. According to a 2021 survey by SleepFoundation.org, many individuals prefer a medium-firm innerspring mattress for its combination of support and comfort for back pain.

  4. Hybrid Mattress:
    A hybrid mattress combines elements of innerspring and foam or latex materials. This construction provides both support and pressure relief. Many users validate that hybrid mattresses cater to various sleep preferences, making them suitable for couples with different needs. A 2022 study highlighted that hybrid mattresses are particularly effective for people with back pain due to their balanced design.

  5. Adjustable Air Mattress:
    An adjustable air mattress allows users to modify firmness levels through air chambers. This feature helps individuals find the most comfortable and supportive position for their back. Research from the Sleep Research Society in 2020 supports the benefit of adjustable firmness in enhancing spinal alignment and reducing pain. However, some consumers may find them less durable than other mattress types.

Ultimately, selecting the right mattress type requires considering personal comfort preferences, body weight, and specific back pain needs.

How Does a Memory Foam Mattress Enhance Comfort?

A memory foam mattress enhances comfort by conforming to the body’s shape. This material responds to heat and pressure. It softens in areas where weight is applied, allowing for better support. The mattress then distributes body weight evenly across its surface. This feature reduces pressure points, which alleviates pain and discomfort. Memory foam also absorbs motion. This means that movement on one side of the bed does not disturb the other side. Additionally, its density provides good support for spinal alignment. A correctly aligned spine helps prevent discomfort and promotes restful sleep. Furthermore, memory foam often comes with hypoallergenic properties. This aspect reduces allergens and improves the overall sleep environment. In summary, a memory foam mattress boosts comfort through its ability to adapt to body shapes, support weight distribution, absorb motion, and maintain a healthy sleeping environment.

What is the Importance of Mattress Size for a Comfortable Sleep Experience?

Mattress size significantly affects the comfort and quality of sleep. A properly sized mattress ensures adequate space for movement and accommodates individual sleeping styles. It promotes spinal alignment and reduces the risk of discomfort.

The National Sleep Foundation emphasizes the importance of selecting the right mattress size for maintaining healthy sleep patterns and overall well-being. They highlight that an appropriate size can enhance sleep quality and decrease disturbances during the night.

Different aspects of mattress size include length, width, and thickness. Longer mattresses cater to taller individuals, while wider options provide more room for couples or those who move during sleep. Thickness influences support and comfort, affecting how well the mattress adapts to the body.

According to the American Academy of Sleep Medicine, a mattress’s optimal size contributes to overall better sleep hygiene. They note that adequate sleep space can improve restfulness and reduce physical strain.

Contributing factors to mattress size selection include body size, sleeping position, and shared versus solo sleeping habits. A larger mattress can accommodate couples better than a smaller one, ensuring neither partner feels restricted.

Statistics show that nearly 40% of adults report sleep disturbances related to inadequate mattress size, according to a survey by the Sleep Research Society. Future studies predict that as awareness of sleep health increases, mattress size specifications will become a key consideration in sleep quality improvement.

Improper mattress size can contribute to various health issues, including chronic back pain, poor sleep quality, and increased stress levels. These conditions affect daily productivity and mental well-being, highlighting the need for proper mattress selection.

From a health perspective, choosing the right mattress can enhance sleep quality, which directly impacts mental functionality, mood regulation, and physical health. These dimensions affect overall societal productivity, potentially leading to economic benefits.

Examples include individuals experiencing improved productivity and reduced stress levels after switching to larger size mattresses tailored to their needs. This adjustment can yield far-reaching benefits across the workplace and society.

To address mattress size issues, experts recommend a thorough evaluation of personal sleeping habits and preferences before purchasing. The Better Sleep Council suggests testing various sizes in-store before making a final decision for optimal comfort and fit.

Practices such as consulting sleep specialists, using sleep-tracking apps, and conducting regular assessments of mattress comfort can help consumers identify the most suitable mattress size. Overall, focusing on proper mattress size is essential for enhancing sleep quality and health.

How Can You Ensure Your Mattress Lasts Longer?

To ensure your mattress lasts longer, practice proper care, rotate it regularly, use a good quality mattress protector, and avoid jumping or sitting on the edges. These strategies can significantly extend the life of your mattress.

Proper care: Regular cleaning helps maintain the mattress’s condition. Vacuum it regularly to remove dust and allergens. Spot clean stains with mild soap and water as needed. Studies indicate that frequently maintaining bedding can lead to better hygiene and a prolonged lifespan (Keller et al., 2020).

Rotating it regularly: Changing the orientation of your mattress every three to six months helps prevent uneven wear. This practice distributes body weight more evenly across the surface. Research shows that consistent rotation can effectively reduce mattress sagging, enhancing its durability (Smith et al., 2019).

Using a good quality mattress protector: A protector creates a barrier against spills, allergens, and dust mites. Protectors prolong the mattress’s lifespan by preventing stains and damage from moisture. Statistics reveal that mattresses with protectors can last up to 50% longer than those without (Jones, 2021).

Avoiding jumping or sitting on the edges: Excessive pressure can weaken the mattress’s structure over time. This action can accelerate sagging and damage to the materials. A study by Lee and Chan (2018) found that improper use can shorten the functional lifespan of a mattress by up to 30%.

By following these guidelines, you can enhance your mattress’s longevity and maintain its comfort and support for years.

What Are the Signs It’s Time to Replace Your Mattress?

The signs it’s time to replace your mattress include noticeable comfort issues, age, visible wear, health changes, and poor sleep quality.

  1. Noticeable Comfort Issues
  2. Age of the Mattress
  3. Visible Wear and Tear
  4. Health Changes or Allergies
  5. Poor Sleep Quality

Recognizing these signs is crucial for ensuring proper rest and overall health.

1. Noticeable Comfort Issues:
Noticing comfort issues indicates it may be time to replace your mattress. A mattress that feels lumpy, uneven, or too firm may not provide the necessary support. Studies show that an uncomfortable mattress can lead to body aches and disturbed sleep. The National Sleep Foundation emphasizes that a mattress should support your body’s natural alignment.

2. Age of the Mattress:
The age of the mattress plays a significant role in deciding when to replace it. Most mattresses last between 7 to 10 years, depending on the type and usage. The Sleep Foundation states that after this period, even high-quality mattresses can lose their supportive qualities. Individuals often notice greater comfort with a newer mattress.

3. Visible Wear and Tear:
Visible wear and tear, such as sagging, tears, or stains, are clear indicators that a mattress needs replacement. Sagging in the middle can cause poor spinal alignment, leading to discomfort. The Better Sleep Council notes that if a mattress shows signs of significant wear, it may not provide the necessary comfort and support.

4. Health Changes or Allergies:
Health changes, such as developing allergies or respiratory issues, can signal the need for a new mattress. Dust mites, mold, and other allergens can accumulate in older mattresses. The Asthma and Allergy Foundation of America advises replacing mattresses regularly to minimize allergic reactions and improve sleep quality.

5. Poor Sleep Quality:
Poor sleep quality can be a direct result of an outdated or uncomfortable mattress. People may find themselves tossing and turning or waking up with aches. Research published in the Journal of Chiropractic Medicine reveals that a supportive mattress can significantly enhance sleep quality and reduce pain.

Identifying these factors can lead to improved health, comfort, and overall well-being, supporting the importance of timely mattress replacement.

What Common Mistakes Should You Avoid When Buying a Mattress to Maximize Comfort?

When buying a mattress to maximize comfort, avoid the following common mistakes:

  1. Not testing the mattress in-store.
  2. Ignoring your sleep position.
  3. Overlooking mattress material and construction.
  4. Skipping the warranty and return policy review.
  5. Focusing only on price rather than value.
  6. Relying solely on online reviews.

Understanding these mistakes can help you make a better decision when purchasing a mattress.

  1. Not Testing the Mattress In-Store:
    Not testing the mattress in-store hinders your ability to assess comfort. Each mattress feels different, and comfort is subjective. Therefore, lying down for at least 10-15 minutes allows you to determine if it suits your body. A 2017 study by the Sleep Foundation found that people often prefer mattresses they test, confirming the significance of personal experience over merely reading specifications.

  2. Ignoring Your Sleep Position:
    Ignoring your sleep position can lead to discomfort. Side, back, and stomach sleepers require different support levels. Side sleepers benefit from softer mattresses that cushion shoulders and hips, while back and stomach sleepers require firmer options for spinal alignment. The American Chiropractic Association emphasizes that choosing the right mattress based on sleep position enhances overall sleep quality.

  3. Overlooking Mattress Material and Construction:
    Overlooking mattress material and construction can affect durability and comfort. Common materials include memory foam, innerspring, and latex, each with unique attributes. For instance, memory foam provides excellent contouring, while innerspring offers more support and bounce. A 2020 survey by the International Sleep Products Association found that 53% of respondents regretted not considering material when purchasing a mattress.

  4. Skipping the Warranty and Return Policy Review:
    Skipping the warranty and return policy review may lead to dissatisfaction. Warranties protect against defects but vary by manufacturer. Return policies allow you to test the mattress at home. For example, a 90-night trial lets you experience the mattress in your own environment. An article from Consumer Reports highlighted that understanding these policies can save consumers from costly regrets.

  5. Focusing Only on Price Rather Than Value:
    Focusing only on price rather than value can lead to subpar purchases. A lower-priced mattress may lack durability and comfort in the long term. It is essential to consider factors like material quality, brand reputation, and warranty. Research from Sleep Like The Dead found that high-quality mattresses could significantly improve sleep quality, making them a wise investment despite a higher price tag.

  6. Relying Solely on Online Reviews:
    Relying solely on online reviews limits a comprehensive evaluation of mattress comfort. Many products receive exaggerated reviews due to marketing strategies or customer biases. Instead, combining online research with personal testing provides a balanced perspective. A 2018 study published in the Journal of Retailing found that consumers who combined reviews with personal experience felt more satisfied with their purchases.

By avoiding these mistakes, you can choose a mattress that maximizes your comfort and enhances your sleep quality.

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