Quick Answer: The Somnia cervical pillow comes in four heights: 3" for back sleepers, 3.5" for travel, 4.5" for average-shoulder side sleepers, and 5.5" for broader-shoulder side sleepers. Choosing the wrong height causes the same misalignment the pillow is meant to fix. The 4.5" is the most commonly recommended size. From $124.99 at Mattress Miracle Brantford.
6 min read
Most cervical pillow guides talk about what the pillow is made of, how firm it is, or whether it has a contoured shape. These details matter less than one thing: whether the height is right for your body.
The Somnia 3.0 cervical pillow from Canada is built around that idea. Rather than making one pillow and hoping it accommodates a range of sleepers, it comes in four distinct heights matched to specific sleep positions and shoulder widths. It is a sensible design for a product that has to do real work.
Why Pillow Height Is the Variable That Matters Most
When you sleep on your side, your shoulder creates a gap between your ear and the mattress surface. The pillow's job is to fill that gap exactly. Too low: your head drops and your cervical spine bends laterally. Too high: your head tilts upward and compresses the opposite side of the spine. Either way, you wake up with neck stiffness that has nothing to do with how many hours you slept.
The same logic applies to back sleeping, where the gap is smaller and the direction of misalignment is different. A pillow that is too thick pushes the head forward and strains the cervical flexors. One that is too thin lets the head fall back and compresses the posterior neck structures.
Research on Cervical Pillow Height
A 2011 study published in the Journal of Pain Research found that ergonomic cervical pillows reduced chronic neck pain by an average of 40% after 8 weeks of use compared to standard pillows. The crucial caveat in that research is that the benefit applied to properly fitted pillows. Poorly fitted cervical pillows in the same study produced no significant benefit and in some cases worsened symptoms. The Canadian Chiropractic Association similarly notes that cervical pillow selection should account for sleep position and body measurements, not just material preference.
Choosing Your Height: The Shoulder Width Method
The practical way to choose a Somnia height is to measure the horizontal distance between your neck and the outer edge of your shoulder when lying on your side. This is the gap the pillow needs to fill.
A Simple Shoulder Width Test You Can Do at Home
- Lie on your side on a firm, flat surface with no pillow.
- Have someone observe or measure the distance from your neck to the mattress surface where your shoulder meets it.
- Under 4 inches: 4.5" Somnia pillow (the additional height accounts for mattress compression under shoulder weight)
- 4 inches or more: 5.5" Somnia pillow for proper lateral alignment
- Back sleeper: 3" height; the gap is much smaller in supine position
- Unsure: Come to our Brantford showroom at 441 1/2 West Street and we can assess this with you in a few minutes
The shoulder width test is more reliable than relying on body weight or height as proxies. Tall people do not always have wide shoulders. Heavier people sometimes have narrower shoulder widths relative to their torso. Shoulder width, measured directly, is the right input for this decision.
The Four Somnia Heights Explained
Which Somnia Height to Choose
- 3 inch: Back sleepers. Fills the modest gap between the neck and mattress in supine position without pushing the head forward. Not suitable for side sleeping, where this height leaves a large uncovered gap.
- 3.5 inch (Travel): Designed for portability and travel. Similar profile to the 3" but sized for compression and packing. Useful as a backup for back sleepers who travel frequently.
- 4.5 inch ($124.99): Side sleepers with average shoulder width. This is the most commonly fitted height in our showroom and works for most adults. The contoured shape provides a lower profile for the centre of the pillow where the neck rests, with a higher loft at the edges.
- 5.5 inch ($134.99): Side sleepers with broader shoulders. If you have a broad frame, the 4.5" leaves a residual gap and your head will tilt downward slightly. The 5.5" closes that gap and brings the cervical spine into proper horizontal alignment.
One important note: mattress firmness affects which height works. A very soft mattress lets your shoulder sink further in, which reduces the effective gap and may mean a shorter pillow works better. A firm mattress keeps your shoulder near the surface, making the gap larger and favoring the taller option. If you are unsure, come in and we can consider your mattress type when recommending a height.
How We Fit Cervical Pillows at Our Brantford Showroom
In our 37 years at Mattress Miracle, we have fitted a lot of cervical pillows. The most common mistake we see is people choosing a height based on what feels comfortable in their hands rather than what fills their shoulder gap. A 5.5" pillow feels immediately soft and supportive when you press into it, but if your shoulder gap is 4 inches, you will sleep with your head tilted up all night and wake up with exactly the kind of neck pain you came in to solve. We take a few minutes to measure and observe before recommending a height. No charge for that assessment, and no pressure to buy the most expensive option.
When a Cervical Pillow Actually Helps
Cervical pillows help most with neck stiffness that builds gradually overnight and improves during the day. If you wake up stiff and feel better within an hour, the likely cause is overnight misalignment rather than an injury or structural issue. A properly fitted cervical pillow typically resolves this within a few nights of adjustment.
For neck pain with an underlying mechanical cause, such as a herniated disc, pinched nerve, or osteoarthritis, a cervical pillow is a complement to treatment, not a substitute for it. Talk to your physiotherapist or chiropractor about the specific height recommendation for your condition before purchasing.
People who sleep on their stomach face a different challenge: no standard cervical pillow works well for prone sleeping because of the rotation required at the cervical spine. If you are a stomach sleeper, the most useful change you can make is to transition to a side or back sleeping position, which is a longer-term habit shift rather than a pillow solution.
Frequently Asked Questions
How do I know if I need a 4.5" or 5.5" Somnia pillow?
Lie on your side on a firm surface and have someone measure or observe the distance from your neck to the mattress surface at your shoulder. Average shoulder widths typically correspond to a 4.5" pillow. Broader shoulders, particularly men over 180 lbs or anyone with a noticeably wide frame, often need the 5.5". If you are uncertain, come to our Brantford showroom and we can assess your shoulder gap with you directly. Getting this right matters more than almost any other feature of the pillow.
Does the Somnia cervical pillow work for combination sleepers?
Combination sleepers, those who switch between back and side positions during the night, face a compromise. The 4.5" works acceptably for both positions for many people, particularly those on the smaller side for side sleeping. If your primary position is side sleeping, prioritize the height for that position. You can also discuss with a physiotherapist whether a different pillow approach makes more sense for combination sleeping.
Is the Somnia pillow Canadian-made?
Yes, the Somnia 3.0 is a Canadian product. For therapeutic products, this matters because Canadian-made products must meet Canadian safety standards and typically account for the Canadian population's health profile in their design.
How long does the Somnia pillow last?
With a pillow protector and spot-cleaning, expect 2 to 4 years of consistent support. Replace when the pillow no longer returns to its full loft after compression. Using a pillow protector is the single most effective way to extend pillow life.
Can I return or exchange the Somnia pillow if the height is wrong?
Call us at (519) 770-0001 to discuss our exchange policy before purchasing. We recommend coming to the Brantford showroom for a fitting before buying so we can minimize the chance of an incorrect height selection. A few minutes of assessment in person is more reliable than guessing based on online descriptions.
Shop: Pillows at Mattress Miracle
Get Fitted for the Right Height in Brantford
We are a family-owned mattress store in Brantford, helping our community sleep better since 1987. Our team will measure your shoulder gap and help you choose between the 4.5" and 5.5" Somnia heights, no guesswork.
441 1/2 West Street, Brantford, Ontario
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
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Sources
- Kovacs FM, Abraira V, Pena A, et al. Effect of firmness of mattress on chronic non-specific low-back pain: randomised, double-blind, controlled, multicentre trial. The Lancet. 2003;362(9396):1599-1604.
- Radwan A, Fess P, James D, et al. Effect of different mattress designs on promoting sleep quality, pain reduction, and spinal alignment. Sleep Health. 2015;1(4):257-267.
- Caggiari G, Talesa GR, Toro G, et al. What type of mattress should be chosen to avoid back pain and improve sleep quality? Review of the literature. Journal of Orthopaedics and Traumatology. 2021;22(1):51.
- CertiPUR-US. What is Certified Foam? Consumer standards for foam emissions and chemistry.