Why Side Sleepers Need Different Support
Side sleeping is the most common sleep position in Canada, approximately 60–70% of adults sleep primarily on their side. It's associated with lower rates of back pain, snoring, and acid reflux compared to back or stomach sleeping. However, side sleeping creates specific pressure dynamics that mattress selection must address:
In side sleeping, the body contacts the mattress at two main points, the shoulder and the hip. These are the narrowest horizontal points in side position, meaning body weight is concentrated there. The waist (the narrowest section) hovers above the mattress surface. For proper spinal alignment:
- The shoulder must sink enough to avoid being pushed upward (which curves the spine laterally)
- The hip must sink proportionally to maintain horizontal spinal alignment
- The waist should be supported (not sagging) between the shoulder and hip
Ideal Firmness for Side Sleepers
The general recommendation for side sleepers is medium to medium-soft (approximately 4–6 on the 10-point scale). However, "the right firmness" for a side sleeper depends on:
- Body weight (heavier sleepers compress the mattress more, effectively making it feel softer)
- Shoulder width (broader shoulders need more room to sink in without pressure)
- Hip width relative to waist (wider hip-to-waist ratio needs more contouring at the hip)
- Personal preference for how deeply you want to feel the mattress
A medium (5/10) mattress works well for average-weight side sleepers (60–90 kg). Lighter sleepers may need softer; heavier sleepers may need slightly firmer to avoid excessive sinkage in the midsection.
Body Weight Adjustments for Side Sleepers
- Under 55 kg: Soft to medium-soft (3–4/10), lighter weight means less compression; a medium mattress may feel too firm and create pressure points
- 55–90 kg: Medium to medium-soft (4–6/10), the standard side sleeper range; most mattress recommendations target this weight range
- 90–115 kg: Medium (5–6/10), more body weight compresses comfort layers further; a soft mattress will allow the midsection to sag, misaligning the spine
- 115+ kg: Medium (5–6/10) with higher-density foam or stronger coil system, standard soft mattresses compress too much; look for mattresses specifically rated for higher weight capacities
Best Mattress Types for Side Sleepers
Memory Foam (Best for Pure Pressure Relief)
Memory foam's body-contouring properties make it naturally suited to side sleeping, it distributes weight evenly across the contact area, reducing peak pressure at shoulders and hips. The limitation: slow response when changing positions; heat retention (particularly problematic for heavier side sleepers who generate more heat); weak edge support.
Hybrid (Best Overall for Side Sleepers)
A hybrid with a soft to medium comfort layer over a pocketed coil support core provides the best combination for most side sleepers: adequate shoulder/hip contouring from the foam comfort layer, better cooling from the coil core, more responsive feel when changing positions, and better edge support. For side sleepers who also run warm or sleep with a partner, hybrid is the stronger choice over foam-only.
Latex (Best for Bounce + Contouring)
Natural latex provides body contouring with faster response than memory foam, latex compresses under pressure but springs back quickly when pressure is removed. This makes position changes easier for side sleepers who move during the night. Also the coolest option. Available in soft to medium firmness levels that suit most side sleepers. Price premium is significant.
Innerspring (Least Ideal for Side Sleepers)
Traditional innerspring mattresses with connected coils provide insufficient pressure relief at shoulders and hips for most side sleepers. The coil system doesn't contour to the body's shape, pressure points remain high. Some softer innerspring options with thick comfort layers can work for side sleepers, but this is not the optimal mattress type for this position.
Shoulder & Hip Pressure Relief
The two most common complaints of side sleepers on wrong mattresses:
Shoulder Pain
Shoulder pain from side sleeping typically indicates the mattress is too firm, the shoulder is being pushed upward rather than allowed to sink in. Solutions:
- Switch to a softer mattress or softer comfort layer
- Add a soft mattress topper (2–3 cm memory foam or latex topper)
- Check pillow height, inadequate head support causes the shoulder to compensate
Hip Pain
Hip pressure in side sleeping is common when the mattress is too firm at the hip zone. The hip, being the heaviest lateral point, needs the most give. Solutions:
- Softer comfort layer, 2–5 cm soft foam above the support core
- A mattress with zoned support (firmer in the lumbar, softer at hip and shoulder zones)
- Sleeping with a pillow between the knees, reduces hip rotation and internal knee pressure
Pillow Selection for Side Sleepers
Pillow selection is as important as mattress choice for side sleepers:
- Height: Side sleepers need a higher loft pillow than back or stomach sleepers, the pillow must fill the gap between the head and shoulder to maintain neutral neck alignment. Too flat = neck bent downward; too high = neck bent upward.
- Support: A medium-firm pillow that holds its shape under head weight (vs. a soft pillow that collapses) provides more consistent neck support throughout the night
- Width: Broader-shouldered sleepers may need a slightly thicker pillow
- Types that work: Latex pillows (responsive, hold shape); high-density memory foam pillows; buckwheat pillows (adjustable fill); specialty side sleeper pillows with contour cutouts
Canadian Mattress Options for Side Sleepers
| Mattress | Type | Side Sleeper Firmness | Queen Price (CAD) | Notes |
|---|---|---|---|---|
| Douglas Original | All-foam | Medium (5/10) | ~$600 | Good value; pressure relief; limited for heavy side sleepers |
| Endy Original | All-foam | Medium (5/10) | ~$795 | Similar to Douglas; stronger brand; same limitations |
| Silk & Snow Hybrid | Hybrid | Medium-Firm (6/10) | ~$1,200 | Slightly firm for side sleepers; works best at average body weight |
| Casper Nova Hybrid | Hybrid | Medium-Soft (4–5/10) | ~$1,500 | Specifically designed for pressure relief; good for side sleepers |
| Helix Moonlight / Midnight | Hybrid | Soft (3–4) / Medium (5) | ~$1,750+ | Widest Canadian-shipping range; Moonlight for lighter/softer preference |
| Beautyrest Silver (Plush) | Hybrid | Plush (4/10) | ~$1,200–$1,500 | Test in person; coil airflow + foam pressure relief |
For most side sleepers at average body weight (60–90 kg), medium (5/10) works well, it allows adequate shoulder and hip sinkage while supporting the waist. Lighter side sleepers (under 60 kg) often prefer soft (3–4/10) as medium feels too firm; heavier side sleepers (over 90 kg) may do better with medium (5–6) as softer options allow excessive midsection sag. Testing in person is the most reliable way to determine your ideal firmness.
Side sleeping is generally the healthiest sleep position for most adults, associated with lower rates of snoring, acid reflux, sleep apnea symptoms, and back pain compared to stomach sleeping. The left-side position specifically is recommended during pregnancy (improves placental blood flow) and for acid reflux sufferers (stomach acid is less likely to enter the esophagus). The primary downside of side sleeping is shoulder and hip pressure, which a properly fitted mattress addresses.
Yes, adding a 2–3 cm soft memory foam or latex topper is one of the most cost-effective solutions for side sleepers who find their current mattress too firm. A topper adds pressure relief at the shoulder without requiring a full mattress replacement. The limitation: if the underlying mattress is very firm, the topper may not provide enough change; if the underlying mattress is already soft and sagging, a topper won't fix support issues.
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