Why Does Shoulder Pain Get Worse at Night? What Your Sleeping Position May Tell You

Shoulder pain can feel different at night.

You may be relatively comfortable during the day but notice more pain when lying down, turning in bed or sleeping on one particular side. For some people, the discomfort can even wake them up or make it difficult to find a comfortable sleeping position.

Night-time shoulder pain does not point to one specific condition. Several shoulder problems can become more noticeable when lying down, while your sleeping position may place additional pressure or stress on an already painful shoulder.

Understanding the pattern can provide useful information, but it cannot identify the exact cause on its own.

Why can shoulder pain feel worse at night?

One reason is that your shoulder remains in a relatively fixed position for an extended period while you sleep.

During the day, you naturally change position and move your arm regularly. At night, you may remain on one side or keep your shoulder in the same position for much longer.

If the shoulder is already painful or sensitive, certain sleeping positions may aggravate the symptoms.

There is also less distraction at night. When you are lying quietly without the activities of the day, pain can become more noticeable.

This does not mean that the pain is necessarily becoming more severe or that sleeping itself is damaging your shoulder.

What does sleeping on the painful shoulder tell you?

If your shoulder hurts more when you sleep directly on it, the position may be placing additional pressure on an already sensitive area.

You may notice that:

The pain increases shortly after lying on that side
You wake up after rolling onto the painful shoulder
You feel soreness when getting out of bed
You naturally avoid sleeping on that side
The shoulder feels stiff after remaining in one position

Sleeping on the painful side is not necessarily the original cause of your shoulder problem.

Instead, it may simply make an existing problem more noticeable.

If you consistently avoid one side because of pain, it is worth paying attention to what other movements or activities also reproduce your symptoms.

What if both shoulders hurt when sleeping?

Pain affecting both shoulders may have different possible explanations from pain that is isolated to one side.

Your sleeping position may still contribute, particularly if you spend long periods with your arms positioned awkwardly or place pressure on both shoulders.

However, bilateral shoulder pain should not automatically be attributed to your mattress or sleeping position.

Consider whether you also experience shoulder pain during the day, stiffness, difficulty raising your arms or symptoms in other joints.

If the problem persists or affects your sleep regularly, an assessment can help determine what may be contributing to the symptoms.

Why can sleeping on your side aggravate shoulder pain?

Side sleeping places your body weight through the side you are lying on.

If that shoulder is already painful, this pressure may make symptoms more noticeable.

The position of your upper arm can also affect how the shoulder feels. Some people find that allowing the upper arm to fall forward or remain in an uncomfortable position increases discomfort.

You do not necessarily have to stop sleeping on your side permanently.

Instead, you can experiment with a position that places less pressure on the painful shoulder while you determine what is causing the problem.

What about sleeping on your stomach?

Sleeping on your stomach can require your head and neck to remain turned to one side, while your arms may also be positioned differently from your normal daytime posture.

For some people, this position may be uncomfortable when they already have shoulder or neck symptoms.

However, there is no single sleeping position that is guaranteed to prevent shoulder pain.

The most useful approach is to identify which positions consistently aggravate your symptoms and modify them where practical.

Can sleeping on your back help?

Some people find sleeping on their back more comfortable because neither shoulder is directly underneath the body.

If your shoulder hurts when lying flat, however, you may still need to adjust the position of your arm.

A pillow supporting the arm can sometimes make a position more comfortable by reducing the feeling of the shoulder being pulled into an uncomfortable position.

The goal is not to find a “perfect” sleeping position.

It is to find a position that allows you to sleep comfortably while your shoulder is being assessed or recovering.

What should you do if shoulder pain wakes you up?

If shoulder pain regularly wakes you during the night, pay attention to the pattern.

Ask yourself:

Which shoulder hurts?
Does it happen only when lying on that side?
Does changing position reduce the pain?
Is the shoulder painful during the day as well?
Did the problem begin after an injury?
Is your shoulder stiff when you wake up?
Are you having difficulty lifting or reaching with the arm?

These details can be useful during a physiotherapy assessment.

Night-time pain on its own does not identify the condition. The broader pattern of symptoms and physical function matters.

Could the problem be more than your sleeping position?

Yes.

Shoulder pain at night can occur with different shoulder conditions, including problems involving the rotator cuff, shoulder tendons, bursae or the shoulder joint.

For example, some people with rotator cuff-related shoulder pain report increased symptoms at night or difficulty sleeping on the affected side.

However, similar symptoms can occur with different conditions.

This is why changing your sleeping position may reduce discomfort without necessarily addressing the reason the shoulder became painful in the first place.

If the pain continues during the day, affects movement or repeatedly interferes with sleep, consider having the shoulder assessed rather than assuming your sleeping position is the main problem.

When may physiotherapy help?

Physiotherapy may be appropriate when shoulder pain is affecting movement, sleep or normal activities.

During an assessment, the physiotherapist may ask about:

When the shoulder pain started
Whether there was an injury
Which movements cause symptoms
Your sleeping position
Your work and exercise activities
Whether you have experienced similar problems before
What activities you currently find difficult

The physical assessment may look at relevant shoulder movement, strength and functional activities.

Depending on the findings, rehabilitation may involve exercise therapy, movement advice, activity modification, manual therapy or other appropriate approaches.

Lo Physiotherapy provides physiotherapy for shoulder pain and other musculoskeletal conditions, with exercise therapy and other treatment approaches selected according to the individual’s condition and needs.

Simple ways to make sleeping more comfortable

While you are dealing with shoulder pain, small changes to your sleeping position may make the night more manageable.

You can try:

Avoiding direct pressure on the painful shoulder.

If lying on that side consistently increases your symptoms, try sleeping on the opposite side or on your back.

Supporting the affected arm.

A pillow can be used to support the arm in a more comfortable position.

Changing position when necessary.

You do not need to force yourself to remain in one position throughout the night.

Paying attention to what happens during the day.

If certain activities consistently aggravate the shoulder, reducing or modifying those activities temporarily may also help while the problem is being assessed.

These measures are intended to improve comfort. They do not replace an assessment when shoulder pain persists.

When should you get shoulder pain assessed?

Consider seeing a physiotherapist if your shoulder pain:

Continues for several weeks
Regularly interferes with sleep
Limits your ability to raise or use your arm
Makes work or exercise difficult
Keeps returning after temporary improvement
Started without an obvious improvement trend
Has not recovered as expected after an injury

You should seek appropriate medical assessment more urgently if shoulder pain follows significant trauma, you are unable to use the arm, there is obvious deformity or severe swelling, or you develop severe or rapidly worsening symptoms.

Shoulder pain accompanied by chest pain, shortness of breath, sweating, nausea or pain spreading to the arm or jaw should also be treated as a potential medical emergency rather than assumed to be a musculoskeletal problem.

Frequently Asked Questions

1. Should I stop sleeping on the side that hurts?

If sleeping directly on the painful shoulder consistently increases your symptoms, temporarily avoiding that position may make it easier to sleep. You can try sleeping on the opposite side or your back and use a pillow to support the affected arm. If the pain continues regardless of position, consider having the shoulder assessed.

2. Why does my shoulder hurt at night but feel better during the day?

Your shoulder may remain in one position for much longer while you sleep, and certain positions can increase pressure or discomfort around an already sensitive shoulder. Night-time symptoms can also become more noticeable when you are resting. If the pain repeatedly disrupts sleep, it is worth assessing rather than assuming your sleeping position is the only cause.

3. Should I use a pillow under my painful shoulder when sleeping?

Supporting the affected arm with a pillow may make some sleeping positions more comfortable by reducing strain or allowing the shoulder to rest in a more comfortable position. There is no single pillow position that works for everyone, so use the position that reduces your symptoms without forcing the shoulder into an uncomfortable posture.

4. When should night-time shoulder pain be checked by a physiotherapist?

Consider an assessment if shoulder pain repeatedly wakes you, continues during the day, limits arm movement, affects work or exercise, or keeps returning. A physiotherapist can assess your shoulder movement, strength and function and determine whether physiotherapy is appropriate or whether further medical assessment may be needed.

Your sleeping position may be a clue, not the diagnosis

If your shoulder hurts whenever you sleep on one side, it is reasonable to adjust your sleeping position.

But the sleeping position itself may not explain why the shoulder became painful.

Night-time symptoms are one part of the overall picture.

A more useful approach is to consider what happens throughout the day, which movements cause discomfort, whether your shoulder strength or mobility has changed and how the problem is affecting your normal activities.

A physiotherapy assessment can help put these symptoms into context and determine whether rehabilitation may be appropriate.

At Lo Physiotherapy, assessment and individualised treatment are used to manage a range of musculoskeletal problems, including shoulder pain treatment.

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