Quick Answer: Side sleepers need a pillow with a loft (height) of 10 to 15 cm (4 to 6 inches) and medium-firm to firm support. The pillow must fill the gap between your shoulder and ear to keep your cervical spine neutral. Memory foam, latex, and adjustable shredded fill work best. In Canada, a quality side sleeper pillow costs $50 to $150. Avoid soft, flat pillows, as they let your head tilt downward and strain your neck.
In This Guide
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About 60% of adults sleep on their side, according to the Canadian Sleep Society. It is the most common sleep position, and for good reason. Side sleeping opens the airway, reduces snoring, and in many cases feels the most natural. But side sleeping puts unique demands on your pillow that most people never think about.
When you lie on your side, your shoulder creates a gap between the mattress surface and your head. If your pillow does not fill that gap, your head tilts down toward the mattress, compressing the vertebrae on one side of your neck and stretching them on the other. Do that for 7 hours a night and you wake up stiff, sore, or with a headache that starts at the base of your skull.
We see this constantly at Mattress Miracle. Someone comes in for a new mattress because they have neck pain, and the problem is actually their $15 pillow from a department store. The fix is often simpler and cheaper than they expected.
Why Side Sleepers Need a Different Pillow
The physics are straightforward. When you lie on your back, there is a small gap between the mattress and the back of your head, maybe 5 to 8 cm. A medium-loft pillow fills that gap easily.
When you lie on your side, your shoulder is 12 to 18 cm wide (depending on your build). That entire width becomes the gap your pillow needs to bridge. A pillow that works perfectly for back sleeping is almost always too thin for side sleeping.
What the Research Shows
A 2019 study in the Journal of Manipulative and Physiological Therapeutics found that pillow height significantly affected cervical spine curvature in side sleepers. Pillows that were too low increased lateral flexion (tilting) of the neck by 15 to 25 degrees. A 2021 review in the journal Spine confirmed that maintaining neutral cervical alignment during sleep reduces morning neck pain and stiffness. The researchers noted that side sleepers benefit most from pillows with a loft of 10 to 15 cm and medium-firm density.
The Right Loft and Firmness for Side Sleeping
Loft is the height of the pillow when it is compressed under your head weight. This is different from the pillow's uncompressed thickness, which is what you see on the shelf.
| Your Build | Shoulder Width | Recommended Pillow Loft | Recommended Firmness |
|---|---|---|---|
| Small frame (under 60 kg) | Narrow | 10-12 cm (4-5 in) | Medium |
| Average frame (60-90 kg) | Medium | 12-14 cm (5-5.5 in) | Medium-firm |
| Large frame (over 90 kg) | Broad | 14-16 cm (5.5-6.5 in) | Firm |
These are starting points, not rules. Your mattress firmness also plays a role. If you sleep on a plush mattress, your shoulder sinks deeper into the surface, reducing the gap your pillow needs to fill. On a firm mattress, your shoulder stays on the surface, making the gap larger. Adjust your pillow loft accordingly.
Dorothy, Sleep Specialist: "The biggest mistake I see is people buying a pillow based on how it feels in their hands. Squeezing a pillow in a store tells you almost nothing. You need to actually lie on your side with the pillow under your head and have someone check if your spine looks straight. That takes 30 seconds and saves months of neck pain."
Fill Materials Compared for Side Sleepers
The fill determines how the pillow supports your head and how long that support lasts.
| Fill Type | Support Level | Loft Retention | Cooling | Price (CAD) | Best For |
|---|---|---|---|---|---|
| Memory foam (solid) | Excellent | Excellent | Poor | $60-$120 | Consistent support, no fluffing needed |
| Shredded memory foam | Very good | Good | Moderate | $50-$100 | Adjustable loft (add/remove fill) |
| Latex (solid or shredded) | Excellent | Excellent | Good | $80-$150 | Responsive support, cooler than memory foam |
| Down alternative | Moderate | Fair | Good | $30-$80 | Budget option, softer feel |
| Down feather | Low-moderate | Poor | Good | $80-$200 | Luxury feel, but not ideal for side support |
| Buckwheat | Firm | Excellent | Excellent | $50-$90 | Natural, adjustable, very firm |
For side sleepers, we generally recommend memory foam (solid or shredded) or latex. These materials maintain their loft overnight without going flat. Down and down alternative pillows feel luxurious, but they compress under head weight, which means your head gradually sinks lower as the night goes on. By 3 a.m., your neck alignment may be completely different from when you fell asleep.
The Case for Adjustable Shredded Fill
Shredded memory foam or shredded latex pillows let you unzip the cover and add or remove fill to customize the loft. This is particularly useful for side sleepers because the ideal loft varies so much based on shoulder width and mattress firmness. You can fine-tune it at home over a few nights instead of guessing in the store.
The Shoulder Gap Test: How to Check Your Pillow at Home
You do not need special equipment. Here is a method you can do tonight.
5-Minute Pillow Check
- Step 1: Lie on your side on your mattress with your pillow under your head. Relax for 60 seconds so the pillow compresses to its working loft.
- Step 2: Have someone stand behind you and look at your spine. Your head, neck, and spine should form a straight horizontal line. Take a photo for reference.
- Step 3: If your head tilts down toward the mattress, the pillow is too thin. If your head tilts up (away from the mattress), the pillow is too thick.
- Step 4: Check for a gap between your neck and the pillow. If there is daylight visible between your neck curve and the pillow surface, the pillow is not supporting your cervical spine properly. A contoured or gusseted pillow may be a better fit.
If you do not have someone to check for you, try this: lie on your side facing a wall and use your phone camera on a timer to take a side photo. It is not as accurate as having someone look, but it shows obvious problems.
Common Mistakes Side Sleepers Make with Pillows
Using one thin pillow. A single standard-thickness pillow (8 to 10 cm loft) is not enough for most side sleepers. Some people stack two thin pillows, but the gap between them creates an unstable surface that shifts during the night.
Choosing by softness. A soft, squishy pillow feels nice in the store but collapses under your head weight. You need enough density to maintain loft when your head is resting on it. A medium-firm pillow may feel less luxurious but it actually does the job.
Ignoring the mattress interaction. Your pillow does not work in isolation. If you recently changed your mattress to a softer model, your old pillow may now be too thick (because your shoulder sinks deeper). If you switched to a firmer mattress, your old pillow may be too thin.
Keeping pillows too long. Most pillows lose 25% to 50% of their loft within 18 to 24 months. Memory foam lasts longer (3 to 5 years) and latex longest (4 to 6 years). If your pillow has visible permanent compression or you need to fold it to get enough height, it is time to replace it.
The Fold Test
Fold your pillow in half and let go. If it springs back to its original shape, it still has life. If it stays folded or slowly unfolds, the fill has broken down and the pillow cannot maintain its loft. This works for all fill types except solid foam, which will always spring back but may still have lost density over time.
Specialty Shapes for Side Sleepers
Contour Pillows
These have a curved profile with a higher edge and a lower centre. The higher edge supports your neck while the lower centre cradles your head. They work well for side sleepers who stay in one position most of the night. If you toss and turn frequently, a contour pillow may not track your movement well.
Gusseted Pillows
A gusset is a panel of fabric sewn around the perimeter that gives the pillow a boxier shape and more consistent thickness edge to edge. Gusseted pillows maintain their loft better than traditional flat-sewn pillows and provide more even support across the entire surface. For side sleepers, a gusseted pillow with 5 cm gussets adds valuable loft without extra filling.
Body Pillows
Full-length body pillows (120 to 150 cm long) support your head, neck, and provide something to hug, which keeps your top arm from pulling your shoulder forward. Pregnant side sleepers often find body pillows especially helpful for hip and lower back support. They are not necessary for everyone, but if you find yourself putting a pillow between your knees for hip alignment, a body pillow does both jobs with one product.
Pillow Shopping in the Brantford Area
Finding the right side sleeper pillow is easier when you can test before buying. At Mattress Miracle, we keep several pillow options in the showroom so you can lie on a mattress and test the pillow in your actual sleep position. Many of our customers from Brantford, Paris, and the surrounding area come in thinking they need a new mattress, and we discover the real issue is their pillow. A $75 pillow upgrade is a lot less expensive than a new mattress.
Canadian Pricing and What to Expect
| Category | Price (CAD) | What You Get | Lifespan |
|---|---|---|---|
| Budget | $20-$40 | Polyester fill, basic cover, minimal support | 6-12 months |
| Mid-range | $40-$80 | Shredded foam or quality down alternative, adjustable, decent support | 2-3 years |
| Premium | $80-$150 | Solid memory foam, latex, or quality shredded fill, cooling features | 3-5 years |
| Luxury | $150+ | Natural latex, organic covers, advanced contouring | 5-7 years |
For side sleepers specifically, we think the $50 to $100 range offers the best value. Below $40, you rarely get enough density to maintain loft for side sleeping. Above $150, you are paying for premium materials that improve comfort but the support benefit plateaus.
One Canadian option worth mentioning: pillows made with Canadian-sourced shredded latex or memory foam are increasingly available. They avoid import markups and often use CertiPUR-US certified foams. Check the fill origin, not just the brand origin, as some "Canadian" pillow brands use imported fill.
Frequently Asked Questions
Should I put a pillow between my knees when side sleeping?
Yes, if you experience hip or lower back discomfort. A pillow between the knees keeps the hips aligned and prevents the top leg from pulling the spine into rotation. A thin, firm pillow works best. This is especially helpful for people with sciatica or SI joint issues. Your physiotherapist can confirm if this is appropriate for your specific condition.
How often should side sleepers replace their pillow?
Every 2 to 3 years for memory foam, 3 to 5 years for latex, and every 12 to 18 months for polyester or down alternative. Side sleepers compress pillows more aggressively than back sleepers because the head weight is concentrated on a smaller surface area. Use the fold test regularly to check if your pillow still has adequate loft.
Is memory foam or latex better for side sleeping?
Both work well. Memory foam contours more closely and provides a cradling feel. Latex is more responsive (bounces back faster) and sleeps cooler. If you tend to overheat at night, latex is the better choice. If you want maximum pressure relief at the ear and temple, memory foam has a slight edge. Both maintain loft significantly better than down or polyester.
Can the wrong pillow cause headaches?
Yes. A pillow that does not maintain neutral cervical alignment can compress nerves and blood vessels at the base of the skull, contributing to tension headaches and cervicogenic headaches. If you consistently wake with headaches that ease within an hour of being upright, your pillow height or firmness may be a contributing factor. Consult your healthcare provider if headaches persist.
Can I try side sleeper pillows at Mattress Miracle?
Yes. We carry pillows in several loft heights and fill types at 441 1/2 West Street in Brantford. We encourage you to lie on a mattress in our showroom and test the pillow in your actual side sleeping position. It takes a few minutes and tells you more than any product description can.
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Good picks for side sleepers at Mattress Miracle:
Or plush mattresses in our Brantford showroom.
Test Pillows in Your Sleep Position
Bring your neck pain questions to our Brantford showroom. We will help you find the right loft and fill for side sleeping. Family-owned since 1987, no pressure.
441 1/2 West Street, Brantford, Ontario
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Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
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