Six weeks in the armchair

THE 30-SECOND VERSION

A sore shoulder is worst at night, and how you lie matters. On your back, with a pillow propping the upper arm, is the kindest position. Not on the sore side.

METHOD OF THE WEEK

How to lie down with a sore shoulder

Of all the joints we cover, this is the one that waits until the small hours to make itself known.

For about six weeks last winter I slept in the armchair in our front room. Not because I wanted to. Because every time I lay down flat and rolled onto my right side, the shoulder woke me at around three in the morning, and by the fourth night in a row I had stopped arguing about it.

Carol thought I was being dramatic until she tried to shift me back to the bed and watched what happened. There is something particular about shoulders. A sore knee will let you sleep. A sore shoulder seems to wait until the house is quiet and then start complaining.

There is research on this, and one finding in particular gave me pause. It also came with a catch that I want to be honest about.

QUICK QUIZ · TAP TO ANSWER

In a study of people with pain in just one shoulder, which shoulder was it usually?

Tap your guess. A ready-to-send reply opens. Just press send and we’ll tell you if you got it right.

The side they slept on

The side they did not sleep on

There was no pattern at all

THE METHOD

Take the weight off, and prop the elbow

Start with what happens when you lie on a shoulder. Your arm normally hangs off the side of your body, so when you roll onto it, that shoulder carries a good share of your upper body against the mattress. Measurements comparing the usual sleeping positions found that lying on your side produces the most pressure inside the shoulder of any of them.

Remember yesterday, and the narrow gap under that bony roof where the cuff tendons run. Squash the joint from the side for several hours and you are pressing on exactly that. Hence three in the morning.

So the kindest position is on your back. But there is a detail that makes all the difference, and almost nobody is told it. Lying flat, your upper arm tends to drop backward toward the mattress, which pulls on the front of the shoulder all night. Slide a pillow or a folded towel under that upper arm and elbow so the arm is held level with your body rather than sagging behind it.

If you cannot sleep on your back, and plenty of people cannot, the next best thing is the other side. Roll onto the good shoulder and hug a pillow in front of your chest, so the sore arm rests on top of it. That stops the painful arm flopping across your body, which turns the shoulder inward and closes that gap again.

And put your arms down

One more, from a study of over a thousand workers. Sleeping with your arms above your head or tucked behind it went along with more rotator cuff trouble, while lying on your back with your arms down did better. If you are an arms-overhead sleeper, that is worth knowing.

Now the catch I promised

These studies looked at people at one moment in time. They found that the painful shoulder and the slept-on shoulder tend to be the same one. What they cannot tell us is which came first. Did lying on it irritate the shoulder, or did a sore shoulder simply make that side unbearable and therefore memorable? Nobody has run the trial that would settle it. So I would not promise you that changing position cures anything. I would say it is free, it is sensible, and on a good night it buys you some sleep, which is worth having on its own.

⚠ NIGHT PAIN WORTH REPORTING

Tell your doctor about these

Losing sleep to a shoulder is common, and still worth mentioning. See a doctor if:

● The pain wakes you every night, or no position at all gives relief.

● You cannot lift the arm, or the weakness came on suddenly, especially after a fall.

● Shoulder pain comes with chest tightness, sweating, or shortness of breath. That needs emergency care.

When in doubt, get it checked. PainFree adds to your doctor’s care. It never replaces it.

THIS WEEK’S QUICK WINS

Three ways to get through the night

🛏 Prop the elbow, not just the head

A folded towel under the upper arm when you lie on your back stops it sagging behind you and tugging the front of the shoulder. It is the smallest change here and the one that helped me most.

Free • A towel will do

🪵 Build a wall behind you

If you keep rolling onto the sore side in your sleep, put a long pillow or a rolled blanket against that side of your body. You cannot govern what you do at two in the morning, so let the bedding do it for you.

Free • Stops the unconscious roll

😴 Take the sleep loss seriously

Pain and sleep run both ways. A broken night raises the next day’s pain, which then costs you the next night. Breaking that loop is worth as much as any exercise, so tell your doctor if it is happening often.

Nightly • The loop runs in both directions

RESEARCH BRIEF

A real link, and an unanswered question

Danish researchers studied 83 people who had pain in one shoulder only, and asked which side they slept on. The painful shoulder was usually the slept-on one. A larger cross-sectional study found that sleeping with the arms above or behind the head went along with more rotator cuff pain, while back-sleeping with arms down fared better. And when researchers compared pressure inside the shoulder across the common positions, side-lying came out highest. Here is the limitation, and it matters. All of these looked at people at a single moment. None can tell us whether the position brought on the pain, or whether the pain simply ruined that side for sleeping. Treat these as good reasons to change how you lie, not as proof of cause.

83

patients whose sore shoulder was usually the one they slept on

Highest

pressure inside the shoulder comes from lying on your side

Arms down

did better than arms above or behind the head

Nobody has proved that changing position treats the shoulder. It does, on a good night, let you sleep. That alone earns its place.

WHAT THE EVIDENCE SAYS

Three ways to lie, graded

On your back, arm propped

The kindest arrangement. No weight through the joint, and a pillow under the upper arm stops it dragging backward. Keep the arms down rather than overhead.

On the good side, hugging a pillow

A sound second choice if your back is not an option. The pillow keeps the sore arm from flopping across your chest and closing up the joint.

On the sore shoulder

The one to avoid where you can. It puts the most pressure through the joint for hours at a stretch, which is a long time to lean on a tender tendon.

If you sleep propped up for breathing or reflux reasons, keep to your doctor’s advice and adapt the arm support around it.

WORTH KNOWING

A symptom

Night pain and being unable to lie on that side are so characteristic of shoulder trouble that clinicians treat them as telling features, not side notes. Few other joints behave this way. So when you mention sleepless nights to your doctor, you are not complaining. You are handing over useful information.

From the clinical picture of shoulder pain.

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