Best Mattress Firmness for Side Sleepers (Australia)
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Most side sleepers sleep best on a soft to medium mattress firmness (around 3–6/10) because it provides enough cushioning for pressure points while still supporting proper spinal alignment.
When you sleep on your side, your shoulders and hips naturally press deeper into the mattress. A mattress that is too firm may create pressure around these areas, while a mattress that is too soft may allow your body to sink too much.
A good mattress firmness for side sleepers should:
- Cushion the shoulders and hips
- Keep the spine in a neutral position
- Provide support without feeling too rigid
A quick guide:
| Side Sleeper Type | Recommended Firmness |
|---|---|
| Lightweight side sleeper (under 60kg) | Soft–Medium |
| Average weight side sleeper (60–90kg) | Medium |
| Heavier side sleeper (over 90kg) | Medium–Medium-Firm |
However, the ideal firmness is not only about sleeping position. Your body weight, preferred comfort level, and mattress materials can all change how a mattress feels.
Why Side Sleepers Usually Need a Softer Mattress
Side sleeping creates more pressure on specific areas of the body compared with back or stomach sleeping.
Your:
- Shoulders
- Hips
- Outer knees
carry more weight because they make direct contact with the mattress.
A mattress with enough cushioning allows these areas to sink slightly, helping spread pressure more evenly across the sleep surface.
Better Pressure Relief Around Shoulders and Hips
One of the biggest complaints from side sleepers is waking up with pressure or discomfort around the shoulder or hip area.
A softer comfort layer can help the mattress adapt to your body's shape, reducing the feeling of pressure building up during the night.
Maintaining Healthy Spinal Alignment
Softness alone is not the goal.
A mattress that is too soft may allow your hips to sink lower than your shoulders, which can put your spine into an unnatural position.
The ideal side sleeper mattress provides a balance:
- Enough cushioning for your pressure points
- Enough support to keep your spine aligned
Soft vs Medium Mattress for Side Sleepers
Both soft and medium mattresses can work well for side sleepers. The better choice depends on your body type and the kind of feel you prefer.
| Firmness Level | Feel | Best For | Possible Drawback |
|---|---|---|---|
| Soft (3–4/10) | Plush, contouring, deeper sink | Lightweight side sleepers who like a softer feel | May feel less supportive for heavier sleepers |
| Medium (5–6/10) | Balanced cushioning and support | Most side sleepers | May not provide enough pressure relief for some users |
| Medium-Firm (6–7/10) | More supportive with less sink | Heavier side sleepers or those who prefer stronger support | Can feel too firm around shoulders for some sleepers |
For many side sleepers, a medium feel offers the best balance because it provides pressure relief without excessive sinking.
How Body Weight Changes Mattress Firmness for Side Sleepers
The same mattress can feel completely different depending on who sleeps on it.
This is because body weight affects how much the mattress compresses.
Lightweight Side Sleepers (Under 60kg)
Lighter sleepers usually place less pressure on the mattress, which means firmer mattresses may feel harder.
A softer feel can help provide enough contouring around the shoulders and hips.
Recommended firmness:
Soft to Medium (3–5/10)
Average Weight Side Sleepers (60–90kg)
Most side sleepers in this range usually prefer a balanced mattress feel.
A medium firmness level often provides enough cushioning while maintaining support.
Recommended firmness:
Medium (5–6/10)
Heavier Side Sleepers (Over 90kg)
Heavier sleepers compress the mattress more deeply, which can make softer mattresses feel less supportive.
A slightly firmer mattress may help prevent excessive sinking around the hips.
Recommended firmness:
Medium to Medium-Firm (6–7/10)
How Mattress Type Affects Firmness for Side Sleepers
Firmness is not only determined by the rating on the mattress label. The materials inside the mattress also affect how it feels.
Memory Foam Mattresses
Memory foam is often popular among side sleepers because it provides:
- Body contouring
- Pressure relief around shoulders and hips
- A slower, more cushioning feel
However, some people may prefer a more responsive surface if they move around frequently during sleep.
Hybrid Mattresses
Hybrid mattresses combine foam comfort layers with support coils.
They often provide:
- Better airflow
- Easier movement
- A balance between cushioning and support
They can be a good option for side sleepers who want pressure relief without a deep sinking feeling.
Latex Mattresses
Latex mattresses usually feel more responsive compared with memory foam.
They provide:
- Natural bounce
- Moderate contouring
- Strong support
Some side sleepers prefer latex because it feels easier to move on while still providing comfort.
Can Side Sleepers Sleep on a Medium-Firm Mattress?
Yes, some side sleepers can sleep comfortably on a medium-firm mattress.
Although many side sleepers prefer softer surfaces, medium-firm can work well depending on:
- Body weight
- Personal comfort preference
- Mattress construction
A medium-firm mattress may be suitable for:
- Heavier side sleepers
- Combination sleepers who switch positions
- People who prefer a more supportive feel
The goal is not choosing the softest mattress available. The right mattress should provide enough cushioning while preventing your body from sinking too deeply.
Signs Your Mattress Is Too Firm for Side Sleeping
A mattress that is too firm may not allow your shoulders and hips to sink naturally.
Common signs include:
- Shoulder soreness after sleeping on your side
- Hip discomfort
- Feeling pressure around your joints
- Feeling like you are sleeping “on top” of the mattress
If you experience these issues, a softer comfort layer may provide better pressure relief.
Signs Your Mattress Is Too Soft for Side Sleeping
A softer mattress is not always better.
If a mattress allows too much sinking, it may reduce support and affect your sleeping posture.
Signs your mattress may be too soft include:
- Your hips sink lower than the rest of your body
- Lower back discomfort after waking up
- Difficulty changing sleeping positions
- Feeling unsupported
The ideal side sleeper mattress should allow your shoulders and hips to sink slightly while keeping your body supported.
Best Mattress Firmness for Side Sleepers
| Sleeper Profile | Recommended Firmness |
|---|---|
| Lightweight side sleeper | Soft–Medium |
| Average weight side sleeper | Medium |
| Heavy side sleeper | Medium–Medium-Firm |
| Side sleeper with shoulder pressure | Softer feel |
| Side sleeper who prefers stronger support | Medium-Firm |
A Practical Option for Australian Side Sleepers
For most side sleepers, the goal is to find a mattress that cushions pressure points without sacrificing support.
The Onebed Original Hybrid Mattress combines adaptive comfort foams with individually wrapped pocket springs to create a medium-firm feel that suits a wide range of sleeping styles. The comfort layers help relieve pressure around the shoulders and hips, while the spring system provides responsive support to keep the spine aligned throughout the night.
If you're looking for a mattress that balances pressure relief, support, and airflow, a medium-firm hybrid design is often one of the most versatile choices for Australian side sleepers.
Final Thoughts
For a complete overview of firmness levels, including soft, medium, medium-firm, and firm options, read our Mattress Firmness Guide Australia.
The best mattress firmness for side sleepers is usually between soft and medium (around 3–6/10).
A mattress that is too firm may create pressure around the shoulders and hips, while a mattress that is too soft may reduce support.
For most side sleepers, the ideal mattress provides:
- Pressure relief around key areas
- Proper spinal alignment
- A comfortable balance between cushioning and support
If you are unsure where to start, a medium firmness is often a reliable choice. Heavier sleepers or those who prefer stronger support may benefit from a medium-firm feel.
FAQ
What firmness level is best for side sleepers?
Most side sleepers prefer a soft to medium mattress firmness (around 3–6/10). The right choice depends on body weight, sleeping position, and personal comfort preference.
Is a soft mattress better for side sleepers?
A soft mattress can be a good choice for side sleepers because it provides cushioning around the shoulders and hips. However, it should still provide enough support to maintain spinal alignment.
Can side sleepers use a firm mattress?
Yes, but a firm mattress may create pressure around the shoulders and hips for some side sleepers. Heavier sleepers may find a firmer mattress more comfortable because they compress the mattress more.
Is medium-firm too firm for side sleepers?
Not always. Medium-firm can work well for heavier side sleepers or people who prefer a more supportive feel. Lightweight side sleepers may prefer a softer mattress for better pressure relief.
Why do my shoulders hurt when sleeping on my side?
Shoulder discomfort can happen when a mattress does not provide enough cushioning. A mattress with better contouring may help reduce pressure around the shoulder area.
Does body weight affect mattress firmness for side sleepers?
Yes. Body weight changes how a mattress feels. Heavier sleepers usually compress a mattress more deeply, while lighter sleepers may experience the same mattress as firmer.
