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Side sleeping can feel like the most natural position in the world, until you wake up with a stiff shoulder, an uncomfortable neck or an arm that has somehow ended up trapped underneath you.

The problem is not necessarily that you sleep on your side. Often, it is that parts of your body are left unsupported throughout the night.

Your head needs the correct pillow height. Your upper arm needs somewhere comfortable to rest. Your hips and legs need enough support to avoid pulling your body into an awkward position.

The good news is that a few simple adjustments can make side sleeping feel much more natural.

The quick answer

To sleep comfortably on your side:

Rest your head on a pillow that keeps your neck level.
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Give your top arm somewhere comfortable to rest.
Keep your shoulders and hips from rotating too far forward.
Place support between your thighs and knees.
Consider a full-length body pillow that supports your arms and legs together.

You do not need to force yourself into one perfectly straight position. The aim is simply to support your body well enough that you can relax without feeling twisted or compressed.

1.Keep your head and neck level

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Your regular sleeping pillow should fill the space between your head and the mattress created by the width of your shoulder.

If your pillow is too low, your head may tilt toward the mattress. If it is too high, it may tilt in the opposite direction. A practical guideline is to keep your neck roughly parallel to the mattress instead of noticeably bent upward or downward.

The right pillow height will depend on:

Your shoulder width
Your body size
How deeply you sink into your mattress
The firmness of your pillow
Your usual sleeping position

Someone with broader shoulders may need a taller pillow. Someone who sinks deeply into a soft mattress may need less height.

Your pillow should support your head without pushing it sharply toward either shoulder.

2.Give your top arm somewhere to rest

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Your top arm is often the forgotten part of side sleeping.

Without support, it may hang across your chest, fall heavily onto the mattress or pull your upper shoulder forward. That can rotate your upper body and leave you feeling twisted.

Try resting your top arm on:

A regular pillow
A folded blanket
A body pillow
A cylindrical bolster

The support should hold your arm comfortably without pushing the shoulder upward.

Cleveland Clinic guidance also suggests supporting an uncomfortable arm on a low pillow or folded blanket to keep it more level and supported.

This is one reason hugging a pillow can feel so comfortable: it gives your upper arm and the front of your body somewhere natural to rest.

3.Keep your shoulders and hips balanced

You do not need to keep your body perfectly rigid, but try to avoid allowing your shoulders and hips to rotate in completely different directions.

When the top arm falls far forward, your upper body may follow it.

When the top leg drops onto the mattress, your hips may also rotate forward. You can then end up in a position that is halfway between side sleeping and stomach sleeping.

Aim for a relaxed position where:

One shoulder sits generally above the other
One hip sits generally above the other
Your knees are gently bent
Your upper body is not sharply twisted
Your muscles do not have to actively hold you in place

The goal is comfortable support—not perfect posture.

4.Place support between your legs

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When you lie on your side without leg support, the top knee may fall toward the mattress. This can pull the upper leg, hips and pelvis forward.

Placing a pillow between your knees gives the weight of your top leg somewhere to rest.

Mayo Clinic recommends placing a pillow between the knees when side sleeping and notes that a full-length body pillow can also be used.

For more complete support, position the pillow between more than just the kneecaps. Ideally, it should separate part of your thighs and knees, with the lower leg remaining in a relaxed position.

Keep your legs gently bent rather than pulling your knees tightly against your chest.

5.How to use a body pillow for side sleeping

A regular pillow can support your arm. Another can support your knees. But using several separate pillows can become inconvenient if they shift apart during the night.

A longer body pillow or bolster can support the upper and lower body at the same time.

Here is the correct way to position one:

Lie fully on your side with your head resting on your normal head pillow.
Place the body pillow vertically in front of your torso.
Hug the upper section comfortably with your arms.
Keep the body pillow below your head and neck.
Bring the lower section between your thighs and knees.
Rest your top leg naturally over the pillow.
Adjust the position until your arms, shoulders, hips and legs feel relaxed.

The body pillow should support your arms and legs. It should not replace your regular head pillow.

Avoid squeezing it as tightly as possible. Let the pillow naturally fill the space in front of your body.

6.Make sure the bolster is long enough

A short cushion may support your arms or your knees, but it usually cannot do both at the same time.

For full-body side-sleeping support, the pillow should be long enough to extend from the upper torso toward the thighs and knees.

It should also feel substantial enough that your upper arm and top leg can rest on it without immediately flattening it.

The ideal firmness depends on personal preference:

A softer bolster creates a more plush, sink-in feeling.
A firmer bolster offers stronger resistance and retains its shape more noticeably.
A fuller, heavier bolster may feel more substantial when hugged.
A lightweight pillow may be easier to reposition but can feel less supportive.

There is no single firmness that works for everyone. Choose the feel that allows you to relax most naturally.

7.Consider your mattress too

Pillow positioning is important, but your mattress also affects how your body rests.

A very firm surface may create more noticeable pressure around the bottom shoulder and hip. A very soft mattress may allow the middle of the body to sink more deeply than the head and legs.

Before replacing your mattress, try the easier adjustments first:

Change your head-pillow height
Bring your bottom arm forward
Support your top arm
Place a pillow between your legs
Try a full-length body pillow
Experiment with sleeping on the opposite side

Sometimes, a simple change in support can make a noticeable difference in comfort.

Should you stay on one side all night?

There is no need to force yourself to remain perfectly still.

Many people naturally change positions throughout the night. You may also find one side more comfortable than the other.

If one shoulder already feels uncomfortable, avoid placing your full weight directly on that side when possible. Try the opposite side or another sleeping position until it feels better.

Recurring pain should not automatically be blamed on your sleeping position. Your sleeping setup may contribute to discomfort, but it is not always the underlying cause.

How Koalu supports side sleepers

Koalu is a premium cylindrical body pillow designed to be hugged by the upper body while the lower section rests between the legs.

Its full-length shape gives your arms and legs one continuous place to rest, rather than requiring several smaller pillows.

How to sleep with Koalu

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Rest your head on your normal sleeping pillow.
Place Koalu vertically in front of your body.
Hug the upper section comfortably with your arms.
Keep Koalu away from underneath your head.
Bring the lower section between your thighs and knees.
Rest your top leg naturally over it.
Adjust the position until your body feels comfortable and relaxed.

Koalu is designed to feel full and substantial rather than light or hollow.

Choose your preferred feel

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Signature Soft uses Micro Softy Fiber with a total weight of approximately 2.3 kg. It is designed for people who prefer a softer, fuller and more plush hugging experience.

Signature Firm uses High Resilience Support Fiber with a total weight of approximately 1.8 kg. It has a denser, springier feel for people who prefer stronger support and better shape retention.

Both versions are designed to feel premium, comfortable and satisfyingly full when hugged.

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Support your arms and legs with one full-body bolster.
Discover the Koalu body pillow designed for more comfortable side sleeping.
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Explore Koalu:
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Frequently asked questions\n

Where should my arms go when sleeping on my side?

Bring your bottom arm slightly forward instead of trapping it underneath your head or torso. Rest your top arm on a pillow or body pillow so it does not hang heavily across your chest.

Should a body pillow go underneath my head?

No. Keep your head on your normal sleeping pillow. Position the body pillow lower, where you can hug it with your arms and place it between your legs.

Should I place a pillow between my knees?

Placing a pillow between the knees gives the weight of your top leg somewhere to rest and can help prevent it from falling too far forward. Mayo Clinic includes a pillow between the knees in its side-sleeping positioning guidance.

How bent should my legs be?

Keep your knees gently bent in a relaxed position. You do not need to pull them tightly against your chest unless that position naturally feels comfortable.

How firm should a body pillow be?

That depends on personal preference. A softer pillow feels more plush and compressible, while a firmer pillow gives stronger resistance and may maintain its shape more noticeably.

Why do I wake up with stiff shoulders after side sleeping?

Possible contributors include pressure on the bottom shoulder, unsuitable head-pillow height, trapping the bottom arm or allowing the top arm to pull the upper body forward.

Persistent pain, weakness, tingling or numbness should be discussed with a qualified healthcare professional.

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