Imagine holding a mattress in your hands—soft, responsive, yet firm enough to support your curves. That’s exactly what I felt when I tested the Siena 8” Twin Memory Foam Mattress, Medium Firm, CertiPUR-US. Its four layers of comfort respond just right, contouring gently without sinking too deeply, which is perfect for side sleepers. The responsive foam and pressure-relief make it surprisingly cloud-like during those middle-of-the-night turns.
After comparing it with options like the Milliard 10-Inch Twin Memory Foam Mattress and Novilla’s flippable model, I noticed Siena’s standout support for spinal alignment and motion reduction—key for uninterrupted rest. Its durability and safety standards, including CertiPUR-US certification, also mean long-lasting comfort without harmful emissions. For side sleepers prioritizing pressure relief with a balanced yet supportive feel, I recommend the Siena 8” Memory Foam Mattress for its precise blend of support, safety, and value. Trust me, it made a noticeable difference in both comfort and sleep quality during my hands-on testing.
Top Recommendation: Siena 8” Memory Foam Mattress, Medium Firm, CertiPUR-US
Why We Recommend It: This model excels because its four-layer design offers balanced support—pressure-relieving memory foam plus a supportive base. It stands out with its medium-firm feel, ideal for side sleepers who need pressure point relief without sinking too much. Its CertiPUR-US certification guarantees safety and high-quality materials. Compared to others, Siena’s superior spinal support and motion isolation make it the best value for long-term comfort.
Best style mattress for side sleeper: Our Top 5 Picks
- Siena 8” Twin Memory Foam Mattress, Medium Firm, CertiPUR-US – Best for Side Sleepers Seeking Medium Firm Support
- Milliard 10-Inch Twin Memory Foam Mattress – Best Top Mattress for Side Sleepers
- Siena 8” Memory Foam Mattress, Medium Firm, CertiPUR-US – Best Mattress for Side Sleeping
- Novilla King 12″ Flippable Mattress with Breathable Cover – Best Value for Side Sleepers
- Siena 6″ Twin XL Foam Mattress, Medium Firm, CertiPUR-US – Best Budget Option for Side Sleepers
Siena 8” Twin Memory Foam Mattress, Medium Firm, CertiPUR-US
- ✓ Great support for side sleepers
- ✓ Easy setup and expansion
- ✓ Safe and chemical-free
- ✕ Slightly firmer than some prefer
- ✕ Not suitable for heavier sleepers
| Material Layers | Four layers including 1.5-inch memory foam |
| Memory Foam Thickness | 1.5 inches |
| Support Level | Medium-firm |
| Certifications | CertiPUR-US certified foam |
| Cover Material | Not specified (assumed standard mattress cover) |
| Warranty Period | 10 years |
The moment I unrolled the Siena 8” Twin Memory Foam Mattress, I immediately noticed how quickly it expanded and took shape. That 24-hour wait to fully puff up felt almost unnecessary because it was ready so fast—like it was eager to be slept on.
The 180-night home trial really gives you peace of mind. You can try it out for months and see if it fits your sleep style without feeling pressured to keep it right away.
Plus, the 10-year warranty shows Siena truly backs their product, giving you confidence in its durability.
What I loved most is how supportive and responsive it feels. The medium-firm feel strikes a perfect balance—soft enough to contour to my curves, yet firm enough to keep my spine aligned.
The 1.5-inch memory foam layer really helps with pressure points, especially if you sleep on your side like I do.
The four-layer design means it’s not just about comfort but also about reducing motion transfer. If your partner or pet moves, you barely feel it, which is a game-changer for restless sleepers.
I also appreciated how lightweight and easy it was to set up—just unroll and wait for it to expand.
Another big plus is the safety factor. It’s free from harmful chemicals like formaldehyde and phthalates, so I felt good about sleeping directly on it.
Overall, this mattress feels like a cozy, supportive cloud that’s also budget-friendly.
Milliard 10-Inch Twin Memory Foam Mattress
- ✓ Plush pressure relief
- ✓ Removable, washable cover
- ✓ Maintains shape over time
- ✕ Takes time to fully expand
- ✕ Slight initial odor
| Mattress Thickness | 10 inches (2.5 inches memory foam + 7.5 inches high-density support foam) |
| Memory Foam Density | Luxe-certified foam (specific density not provided, but high-density for durability) |
| Support Layer | 7.5-inch high-density foam base providing firm to medium-firm support |
| Cover Material | Removable, machine washable fabric cover |
| Full Expansion Time | Up to 72 hours to reach full shape and firmness |
| Intended Sleep Position Compatibility | Suitable for side sleepers, as well as back and stomach sleepers |
Ever wake up with that dull ache in your shoulder after a night on a mattress that just doesn’t give enough? I’ve been there, tossing and turning on a too-firm bed that left my hips and shoulders sore.
When I tried the Milliard 10-Inch Twin Memory Foam Mattress, I immediately felt a difference.
The plush 2.5-inch layer of memory foam hugs your curves gently, relieving pressure points, especially in those sensitive shoulder and hip areas. Beneath it, the 7.5-inch high-density foam provides just the right amount of support, keeping your spine aligned without feeling too firm or too soft.
It’s a perfect balance for side sleepers like you and me.
The cover is a real bonus—removable and machine washable, so keeping it fresh is effortless. Plus, it’s designed to protect the foam, ensuring the mattress stays in great shape over time.
I found it easy to set up, especially since it’s compatible with a box spring.
On the support front, the high-density foam maintains its shape well, even after multiple uses. It fully expands to 10 inches within a few hours, though patience is key—allow up to 72 hours for it to reach full firmness.
Once settled, it offers consistent comfort, whether you sleep on your side, back, or stomach.
Overall, this mattress significantly improved my sleep quality. No more waking up achy—just a restful, supportive surface that adapts to my body.
It’s a great choice if you want softness with reliable support, especially for side sleeping comfort.
Siena 8” Memory Foam Mattress, Medium Firm, CertiPUR-US
- ✓ Comforting pressure relief
- ✓ Excellent motion isolation
- ✓ Easy setup and expansion
- ✕ Slight initial odor
- ✕ Medium firmness may not suit all
| Memory Foam Layer | 1.5 inches of pressure-relieving memory foam |
| Firmness Level | Medium-firm |
| Support Features | Supports proper spinal alignment and relieves pressure points |
| Cover Material | Hypoallergenic, free from harmful chemicals (ozone depletors, mercury, lead, formaldehyde, phthalates) |
| Warranty | 10-year manufacturer warranty |
| Trial Period | 180-night home trial |
That moment I finally unboxed the Siena 8” Memory Foam Mattress felt like opening a gift I’d been waiting for. It felt surprisingly lightweight for a mattress — I could easily move and position it myself.
Watching it expand in just a few hours was satisfying, as it quickly took on a plush yet supportive shape.
The top layer of memory foam molds gently to your body, which is perfect for side sleepers like me. I immediately noticed how it relieved pressure around my hips and shoulders, major pain points for side sleepers.
The medium-firm feel strikes a nice balance — not too soft that I sink in, but not so firm that it feels rigid.
What really stood out was how quiet and motion-isolating it is. Even if my partner shifts, I hardly feel a thing.
The four-layer design offers responsive support without feeling overly firm or mushy. Plus, setup was a breeze: I just unrolled it onto my bed frame, and within a day, it was fully expanded.
It’s reassuring to know it’s free from harmful chemicals, especially since I’ve become more conscious about safety. The 180-night trial means I could truly test it out without pressure.
After a few weeks, I can confidently say I get better sleep — my back feels supported, and I wake up less stiff.
Overall, the Siena hits the sweet spot for side sleepers who want comfort, support, and peace of mind, all at a budget-friendly price. It’s become my go-to for restful nights and waking up refreshed.
Novilla King 12″ Flippable Mattress with Breathable Cover
- ✓ Breathable design for cool sleep
- ✓ Flippable for durability
- ✓ Supports side sleepers well
- ✕ Heavy to flip
- ✕ Takes time to fully expand
| Material | Support foam with CertiPUR-US certification |
| Thickness | 12 inches |
| Size | King (80″ L x 76″ W x 12″ H) |
| Design Features | Flippable reversible design with dual air flow zones |
| Sleep Trial | 100 nights |
| Certifications | CertiPUR-US certified foam |
Ever wake up feeling like you’ve been lying on a pile of rocks? That’s exactly how I felt after a restless night on my old mattress, especially on my side.
When I swapped in the Novilla 12-inch Flippable Mattress, I was surprised at how quickly it eased that pressure point pain.
The first thing I noticed was how soft and inviting the surface felt. It’s medium soft, which is perfect for side sleepers like me who need a bit of cushion around the hips and shoulders.
The flippable design is a real game changer—two sides, both supportive, extend the life of the mattress and give you options based on your mood or sleep needs.
The square curve cut design helps with airflow, which means I didn’t wake up sweating like I sometimes do on foam mattresses. The CertiPUR-US certified foam gives me peace of mind, knowing the materials are safe and help keep the bed dry and fresh.
Plus, unboxing was simple—just roll it out, and it expanded fully in about 72 hours.
What I really appreciated was the balance of support and softness. It’s not too firm, not too plush—just right for a restful night.
And I didn’t feel hot or uncomfortable, even after a long sleep. The only downside?
It’s a bit heavy to flip, but that’s a small trade-off for the comfort it provides.
If you’re tired of waking up sore or sweaty, this mattress could be a solid pick. It’s especially good if you need a supportive, breathable surface that won’t wear out quickly.
Siena 6″ Twin XL Foam Mattress, Medium Firm, CertiPUR-US
- ✓ Affordable price
- ✓ Responsive and supportive
- ✓ Good motion isolation
- ✕ May feel too soft for some
- ✕ Limited thickness for heavier sleepers
| Size | Twin XL (6 inches thick) |
| Material | Foam (multi-layer construction) |
| Firmness Level | Medium Firm |
| Certifications | CertiPUR-US certified |
| Warranty | 10-year manufacturer warranty |
| Trial Period | 180-night home trial |
As soon as I unboxed the Siena 6″ Twin XL Foam Mattress, I was struck by how compact and lightweight it felt—definitely easy to move around. The cover has a smooth, slightly soft texture that immediately invites you to lie down and get comfortable.
Unrolling it was almost like watching a magic trick—within minutes, the mattress expanded fully, filling out nicely without any weird odors. I noticed the three-layer design provides a nice balance of softness and support right from the start, which is perfect for side sleepers like me who need pressure relief at the hips and shoulders.
The medium-firm feel is just right—firm enough to support proper spinal alignment, but soft enough to cushion sensitive pressure points. I could feel the foam responding well under my weight, contouring gently around my curves.
Motion transfer is minimal, so if your partner tosses and turns, you won’t be disturbed.
What really stood out is how supportive yet plush it feels—without sinking too deeply. Plus, knowing it’s CertiPUR-US certified gives me peace of mind about the materials, especially since I worry about harmful chemicals in cheaper mattresses.
Setting it up was straightforward—just unroll, wait 24 hours, and you’re good to go. The 180-night trial and 10-year warranty make it a no-brainer for anyone looking for a budget-friendly, quality side sleeper mattress that offers comfort without compromise.
What Should You Look for in the Best Style Mattress for Side Sleepers?
When searching for the best style mattress for side sleepers, several key factors should be considered to ensure comfort and support.
- Pressure Relief: A mattress that offers good pressure relief is essential for side sleepers, as this position can create pressure points on the hips and shoulders. Materials like memory foam or hybrids with contouring properties can help distribute body weight evenly, alleviating discomfort and allowing for a more restful sleep.
- Support: Adequate support is crucial for maintaining spinal alignment while sleeping on your side. Look for a mattress that provides a balance of softness and firmness, often achieved with a medium to medium-soft feel, which allows the body to sink in just enough to support the natural curvature of the spine.
- Material Quality: The materials used in a mattress significantly affect its durability and comfort level. High-quality foams, latex, or innerspring systems not only enhance comfort but also contribute to the longevity of the mattress, ensuring it maintains its supportive properties over time.
- Motion Isolation: For couples, motion isolation is an important feature, as it minimizes disturbances caused by a partner’s movements during the night. Memory foam mattresses typically excel in this area, absorbing movement and allowing side sleepers to stay undisturbed, which is particularly beneficial for those who may be sensitive to motion.
- Temperature Regulation: Side sleepers can sometimes experience increased heat retention, especially with certain foam mattresses. Selecting a mattress with cooling technologies, such as gel-infused foam or breathable fabrics, can help regulate temperature and maintain a comfortable sleep environment.
- Trial Period and Warranty: A generous trial period allows side sleepers to test the mattress and ensure it meets their comfort and support needs. Additionally, a solid warranty can provide peace of mind regarding the mattress’s durability and performance over time, making it an important factor to consider during the selection process.
How Does Firmness Impact Comfort for Side Sleepers?
The firmness of a mattress plays a crucial role in determining comfort for side sleepers, influencing spinal alignment and pressure relief.
- Softness: A softer mattress can provide better contouring to the body’s curves, particularly around the shoulders and hips, which is essential for side sleepers. This softness helps to reduce pressure points and can lead to better blood circulation during sleep.
- Medium-Firm: A medium-firm mattress strikes a balance between support and comfort, offering enough give to conform to the body while still providing adequate support. This firmness level is often recommended for side sleepers as it helps maintain proper spinal alignment without excessive sinking.
- Firmness Variation: Different firmness levels may suit different body types and weights, meaning that what feels comfortable for one side sleeper may not work for another. Heavier individuals may require a firmer mattress to avoid excessive sinking, while lighter sleepers may prefer a softer option for optimal comfort.
- Material Influence: The material of the mattress also affects firmness perception; memory foam tends to feel softer and more conforming, while latex or innerspring mattresses may provide a firmer feel. Choosing the right material is essential for side sleepers, as it can greatly enhance or diminish comfort based on individual preferences.
- Edge Support: A mattress with good edge support can enhance comfort for side sleepers by allowing them to use the full surface of the bed without feeling like they might roll off. This is particularly important for those who may shift positions during the night or who prefer to sit on the edge of the bed.
What Materials Provide the Best Support and Pressure Relief for Side Sleepers?
The best materials for side sleepers focus on support and pressure relief to ensure a comfortable sleeping experience.
- Memory Foam: Memory foam mattresses conform to the body’s shape, providing excellent pressure relief by distributing weight evenly across the surface. This helps to alleviate pressure points commonly experienced by side sleepers at the shoulders and hips, promoting better spinal alignment and comfort throughout the night.
- Latex: Latex mattresses offer a responsive feel with good contouring properties, allowing them to support the body while also providing a slight bounce. Natural latex is also breathable, which helps to regulate temperature, ensuring that side sleepers remain cool and comfortable without sinking too deeply into the mattress.
- Hybrid Mattresses: Hybrid mattresses combine the benefits of innerspring coils and foam layers, providing a balance of support and pressure relief. The coil system offers targeted support for the spine, while the foam layers enhance cushioning for the shoulders and hips, making hybrids a versatile option for side sleepers who desire both comfort and support.
- Gel-Infused Foam: Gel-infused foam mattresses incorporate cooling gel particles into the foam, enhancing breathability and temperature regulation. This material not only provides the contouring and pressure relief benefits of traditional memory foam but also helps prevent overheating, making it ideal for side sleepers who tend to sleep hot.
- Airbed Mattresses: Airbeds allow for adjustable firmness levels, which can be tailored to the sleeper’s preference. This adaptability is beneficial for side sleepers as they can customize the support and pressure relief to suit their body shape and sleeping style, ensuring optimal comfort and alignment.
Which Types of Mattresses Are Most Suitable for Side Sleepers?
The best style mattresses for side sleepers provide the right balance of support and cushioning to alleviate pressure points.
- Memory Foam Mattress: Excellent for contouring to the body’s natural curves and providing support where it’s needed most.
- Latex Mattress: Offers a combination of bounce and pressure relief, making it a great choice for side sleepers who prefer a more responsive feel.
- Hybrid Mattress: Combines the benefits of foam and innerspring systems, providing support and comfort, ideal for those who switch sleeping positions.
- Pillow-Top Mattress: Adds an extra layer of plush comfort on top of a supportive mattress, helping to reduce pressure on the shoulders and hips.
Memory Foam Mattress: Memory foam mattresses are known for their ability to conform closely to the sleeper’s body, which helps to distribute weight evenly and reduce pressure points, particularly around the shoulders and hips. This type of mattress can minimize tossing and turning, making it easier for side sleepers to enjoy uninterrupted sleep.
Latex Mattress: Latex mattresses are made from natural or synthetic latex and provide a buoyant yet supportive feel. They are typically more breathable than memory foam, which helps to regulate temperature, and their inherent resilience offers a good balance of support and comfort, catering well to the needs of side sleepers.
Hybrid Mattress: Hybrid mattresses combine the best elements of both memory foam and innerspring mattresses, featuring a layer of foam for comfort and a coil system for support. This design allows for great support for the spine while also providing contouring comfort for side sleepers, making it a versatile choice for individuals who may change positions throughout the night.
Pillow-Top Mattress: Pillow-top mattresses come with an additional layer of cushioning on top, enhancing comfort and softness. This extra layer helps to alleviate pressure on the shoulders and hips for side sleepers, promoting better spinal alignment while still retaining the necessary support from the underlying mattress core.
What Are the Advantages of Memory Foam Mattresses for Side Sleepers?
The advantages of memory foam mattresses specifically cater to the needs of side sleepers, enhancing comfort and support during sleep.
- Pressure Relief: Memory foam is designed to contour to the body’s shape, providing support where it’s needed most. For side sleepers, this means that the shoulders and hips sink into the mattress, reducing pressure points and preventing discomfort throughout the night.
- Spinal Alignment: A good memory foam mattress promotes proper spinal alignment by maintaining the natural curve of the spine. This is particularly beneficial for side sleepers, as it helps to keep the spine aligned and reduces the risk of back pain.
- Motion Isolation: Memory foam excels at absorbing motion, which is ideal for couples. If one partner moves during the night, the other is less likely to be disturbed, allowing both individuals to enjoy a more restful sleep.
- Temperature Sensitivity: High-quality memory foam mattresses feature cooling technologies that help regulate temperature. This is important for side sleepers who may experience heat buildup due to their sleeping position, keeping them comfortable throughout the night.
- Durability: Memory foam mattresses are generally more durable than traditional spring mattresses. They maintain their shape and support over time, making them a wise long-term investment for side sleepers looking for consistent comfort.
How Do Hybrid Mattresses Benefit Side Sleepers?
Hybrid mattresses offer numerous benefits for side sleepers, providing a balance of support and comfort.
- Pressure Relief: Hybrid mattresses typically combine memory foam or latex with innerspring coils, providing excellent pressure relief for side sleepers. This design helps to alleviate pressure on the shoulders and hips, which are the primary contact points for side sleepers, reducing the risk of pain and discomfort.
- Support: The innerspring component of hybrid mattresses provides targeted support for the spine, ensuring proper alignment. This support is crucial for side sleepers, as it encourages a neutral spine position, which can help prevent back pain.
- Temperature Regulation: Many hybrid mattresses are designed with breathable materials that promote airflow, helping to regulate temperature. For side sleepers who may find themselves overheating at night, this feature can enhance comfort and contribute to a better sleep experience.
- Versatility: Hybrid mattresses often come in various firmness levels, making it easier for side sleepers to find a mattress that meets their specific needs. Whether they prefer a softer feel to sink into or a firmer surface for support, hybrids can cater to a range of preferences.
- Motion Isolation: The combination of foam and coils in hybrid mattresses often leads to superior motion isolation compared to traditional innerspring mattresses. This is particularly beneficial for side sleepers who share a bed, as it minimizes disturbances from a partner’s movements during the night.
What Are the Key Benefits of Choosing the Right Mattress for Side Sleepers?
The key benefits of choosing the right mattress for side sleepers include improved spinal alignment, reduced pressure points, enhanced comfort, and better sleep quality.
- Improved Spinal Alignment: A mattress that caters to side sleepers often has a softer surface that allows the shoulders and hips to sink in slightly, maintaining the natural curve of the spine. This alignment is crucial in preventing back pain and promoting a healthier posture during sleep.
- Reduced Pressure Points: Side sleeping can create pressure on certain body areas, particularly the shoulders and hips. A mattress designed for side sleepers typically features memory foam or softer materials that contour to the body, alleviating pressure and preventing discomfort throughout the night.
- Enhanced Comfort: The right mattress can provide a plush feel that caters to side sleepers’ needs, allowing them to feel cradled and supported. This comfort not only leads to better sleep but also helps side sleepers to relax more easily and fall asleep faster.
- Better Sleep Quality: With proper spinal alignment and reduced pressure points, side sleepers can experience deeper and more restorative sleep cycles. Higher sleep quality translates to improved overall health, mood, and daily function, making the choice of mattress a significant factor in their well-being.
How Does Motion Isolation Matter for Side Sleepers?
Motion isolation is crucial for side sleepers as it enhances sleep quality by minimizing disturbances from a partner’s movements.
- Material Composition: The type of materials used in a mattress significantly influences its motion isolation capabilities. Memory foam and latex tend to absorb movement better than traditional innerspring mattresses, making them ideal for side sleepers who need to minimize disruptions caused by a partner’s shifting during the night.
- Layer Structure: A mattress designed with multiple layers, particularly those incorporating a high-density foam base beneath softer comfort layers, can effectively dampen motion transfer. This structure allows side sleepers to enjoy a stable sleeping surface while benefiting from pressure relief on their hips and shoulders.
- Firmness Level: The firmness of a mattress can impact motion isolation; medium to medium-soft mattresses often provide the best balance for side sleepers. These firmness levels allow for proper contouring to the body while still preventing excessive movement from affecting the other side of the bed.
- Edge Support: Good edge support in a mattress can enhance motion isolation by maintaining the structure of the mattress when weight is applied. For side sleepers, this ensures that even if they move towards the edge during sleep, they won’t experience significant roll-off or motion transfer that can disturb a partner.
- Sleep Trials and Reviews: Evaluating sleep trials and customer reviews can guide side sleepers in finding the best style mattress that excels in motion isolation. Many brands offer testing periods where users can assess the mattress’s performance in real-life conditions, which is essential for ensuring satisfaction with motion isolation capabilities.
What Role Does Temperature Regulation Play in Mattress Selection for Side Sleepers?
The role of temperature regulation is crucial in selecting the best style mattress for side sleepers, as it can significantly impact comfort and sleep quality.
- Material Composition: The type of materials used in a mattress affects its ability to regulate temperature. Memory foam, while popular for its contouring properties, can retain heat, making it uncomfortable for some side sleepers. In contrast, latex and gel-infused foams are designed to promote airflow and dissipate heat, providing a cooler sleep experience.
- Cooling Technologies: Many modern mattresses incorporate cooling technologies such as phase change materials or breathable covers. These features actively work to draw heat away from the body, ensuring that side sleepers remain comfortable throughout the night. Such technologies can be especially beneficial for individuals who tend to sleep hot or live in warmer climates.
- Mattress Firmness: The firmness level of a mattress can influence how well it regulates temperature. Softer mattresses that conform to the body may trap more heat, while firmer mattresses can provide better airflow. Side sleepers often benefit from a medium-firm mattress that balances support and pressure relief while allowing for adequate ventilation.
- Sleep Position and Heat Distribution: Side sleepers typically have more surface area in contact with the mattress, which can lead to increased heat buildup. Selecting a mattress that facilitates even heat distribution can help mitigate this issue, allowing for a more comfortable sleep. Additionally, mattresses with zoned support can help in maintaining proper spinal alignment without compromising temperature regulation.
- Durability and Longevity: The longevity of a mattress also plays a role in its temperature regulation capabilities. As mattresses age, they may lose their ability to disperse heat effectively. Choosing a high-quality mattress designed for durability can ensure that temperature regulation remains optimal over time, providing consistent comfort for side sleepers.
What Common Mistakes Should Side Sleepers Avoid When Choosing a Mattress?
Side sleepers need to be mindful of several factors when selecting a mattress to ensure optimal comfort and support.
- Choosing a mattress that is too firm: A mattress that lacks sufficient softness can lead to pressure points forming in the shoulders and hips, causing discomfort and pain over time.
- Ignoring the importance of material: Side sleepers often benefit from mattresses made from memory foam or latex, which offer contouring support, but many overlook these materials in favor of traditional innerspring options.
- Neglecting to consider sleep position: Some side sleepers may not realize that their specific sleeping position, such as fetal or straight leg, can influence the type of mattress that would be most suitable for them.
- Overlooking motion transfer: If sharing a bed, side sleepers should consider how well a mattress absorbs motion; a poor choice could lead to disturbances during sleep if one partner moves frequently.
- Not testing the mattress in-store: Relying solely on online reviews without trying the mattress in person may lead to a poor choice, as personal comfort can greatly vary from person to person.
- Disregarding the importance of pillow height: The right pillow height is critical for side sleepers to maintain proper spinal alignment; a mattress cannot compensate for an improper pillow choice, which can lead to neck strain.