Hips · Sleep · Side sleepers · 6 min read
Hip pain at night when you lie on your side.
You drift off fine, then an hour later your outer hip is aching and you have to roll over. Roll to the other side and it starts there too. If this is stealing your sleep, there is a clear reason it happens at night, and a simple way to take the pressure off. Here is the science, made simple, and the fix that works while you sleep.
It is a particular kind of misery. You are tired, you want to sleep, and the one position your body wants to be in, on your side, is the exact position that lights up your hip. So you lie on the sore side until it burns, then roll to the other side and let your top leg flop across the bed, and within twenty minutes that hip starts complaining too. You end up on your back staring at the ceiling, doing the maths on how many hours are left before the alarm.
Broken sleep does not stay in the bedroom. It follows you into the next day as a short fuse, a foggy head, a coffee you do not really want, and a workout you skip because you are running on empty. Do it night after night and it wears down your mood, your patience and your motivation. Pain at night is not just a hip problem. It is a whole-life problem, and it deserves a proper fix rather than another night of rolling over.
1 in 4
women over 50 are likely to be affected by lateral (outer) hip pain, the most common cause of this night-time ache.
50 of 62
patients with this hip pain were classed as poor sleepers in a 2025 study, sleeping around 6 hours a night.
4 to 106
the jump in newtons of force squeezing the tendon as the top leg drops across the body. That is the night-time trigger.
Why it hurts at night and not so much in the day.
Outer hip pain that flares in bed is usually not the joint itself wearing out. In most people it is the tendons on the side of the hip becoming irritated, a condition physios call gluteal tendinopathy, or greater trochanteric pain syndrome. It is the most common tendon problem in the lower body, and it hits women far more than men, especially from the mid-forties onwards.
Here is the picture, kept simple. On the outside of your hip there is a bony bump you can feel, the greater trochanter. Two important tendons run over that bump, a bit like a rope running over a pulley. When those tendons get grumpy, they do not like being squashed against the bone. And squashing is exactly what side-lying does.
There are two ways side-lying compresses the tendon, and understanding both is the key to fixing it:
Lying on the painful hip. Your body weight presses the tendon directly into the mattress, like leaning on a bruise for hours. No wonder it wakes you.
Lying on the good hip. This one surprises people. When you lie on the pain-free side and let your top leg slide forward and down across your body, the hip moves into a position called adduction. That tightens the strong band of tissue down the outside of your thigh, the iliotibial band, and it clamps down over the tendons. One study measured that squeeze rising from about 4 newtons to 106 newtons as the hip moved from level to 40 degrees of that drop. In plain terms, letting your top knee fall towards the bed multiplies the pressure on an already sore tendon many times over, and then you hold it there for hours.
That is also why it is worse at night than in the day. In the daytime you are moving, shifting position, unloading the tendon every few minutes. In bed you settle into one compressed position and stay there, so the tissue gets no relief and the pain builds until it forces you to move.
The part that makes it worse: the sleep spiral.
There is a nasty feedback loop here. A 2025 study of people with this exact hip pain found that half or more were poor sleepers, averaging around six hours a night, and that the worse their hip disability, the worse their sleep. That matters because sleep is when tendons and tissues do most of their repair. Short, broken nights blunt that recovery, leave you more sensitive to pain the next day, and make you less likely to keep up the gentle movement that actually helps the hip settle. Poor sleep feeds sore hip, sore hip feeds poor sleep.
The good news is that this loop runs both ways. Protect your sleep, and you are not just resting better, you are giving the tendon the nightly repair window it has been missing. The fastest way to protect that sleep is to stop compressing the hip in the first place.
Our best-selling tool for keeping the hips stacked and level all night.
Shop the Knee PillowHow to actually get through the night.
None of this needs to be complicated or expensive. It comes down to taking the squeeze off the tendon while you sleep, then, over the following weeks, building the hip back up so it stops complaining in the first place. Here is the order that works.
The single biggest lever · every night
Put a firm pillow between your knees.
This is the one that changes your nights. A supportive pillow between the knees stops your top leg dropping forward and down into that compressing position, and keeps your hips stacked in a neutral line. The key word is firm. A squashy bed pillow or a folded duvet collapses under your knee within minutes and lets the hip sag right back into the position that hurts. A contoured, memory-foam knee pillow holds its shape and its height all night, which is the whole point.
If you can
Sleep on the less painful side, not the sore one.
Lying directly on the irritated hip presses the tendon into the mattress all night. Where you have a choice, settle on the better side, still with the pillow between your knees so the upper hip stays supported. If both sides are sore, sleeping on your back with a pillow under your knees takes the side pressure off completely for a while.
All day, quietly
Stop feeding the compression in the daytime.
The same squeeze happens outside of bed. Standing hanging on one hip, sitting with your legs crossed, and slumping into low, soft chairs all push the hip into that compressing position. Try to stand evenly on both feet, keep your knees roughly hip-width when you sit, and avoid crossing your legs. Small changes, repeated all day, mean the tendon is not being aggravated from morning to night.
Every other day · the long-term fix
Strengthen the glutes, gently and progressively.
The night-time tricks buy you relief. Strengthening is what makes the hip robust so it stops flaring at all. Tendons respond to gradual, controlled load. Simple isometric holds to start, then progressing to exercises like a supported side-lying leg lift or a gentle bridge, build the tolerance of the tendon over a few weeks. Go slowly, avoid sharp pain, and be patient, this is a weeks-not-days job.
Daytime release · done right
Release the tight muscles that pull the hip inwards.
Tightness in the glutes and the muscles around the hip adds to that inward pull. A firm massage ball into the meat of the glute, sitting or leaning against a wall, helps those muscles let go. One important caution: do not roll or press directly on the bony point of the hip where it is sore. That is the compression you are trying to avoid. Work the muscle around it, not the tender bump itself.
A few things people get wrong.
Not just resting
Total rest does not fix it.
Wrapping the hip in cotton wool feels sensible, but tendons that are never loaded get weaker and more sensitive, not stronger. You calm it at night, then gently rebuild it. Protect and load, do not just rest.
Pillow height
The height matters.
Your knees should sit at the width of your hips, no more, no less. Too thin and the hip still sags. A firm pillow the right thickness keeps the top leg level with the hip, which is exactly where the pressure comes off.
Do not dig in
Do not roll on the bone.
Grinding a ball straight onto the sore bony point makes it angrier, because that is more compression. Work the glute muscle around it instead, and let the tender spot settle.
Give it time
Weeks, not one night.
The pillow can help your very first night. The tendon itself takes weeks of gentle loading to properly settle. Stick with it, and do not judge progress on a single evening.
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Sports Medica products sold, and a best seller on Amazon.
The Knee Pillow has become a go-to for side sleepers precisely because it does the one thing that matters here: it holds the hips level and takes the pressure off, night after night. Tens of thousands of people have used our tools to get their sleep back.
The simple two-part system.
You can solve most of this with the pillow alone. But if you want to work on the hip properly, the two tools do different jobs and work well together: one takes the pressure off while you sleep, the other releases the tight muscles that keep pulling the hip into trouble during the day.
By night
The Knee Pillow
A contoured memory-foam pillow that sits between your knees and holds your hips stacked and level all night, so the tendon is never squashed into that compressing position. This is the piece that changes how your nights feel, from the very first one.
Shop the Knee PillowBy day
The Peanut & Lacrosse Ball
A firm massage ball to release the glute and hip muscles that pull the leg inwards, working the muscle around the sore point, never the bone itself. A few minutes a day keeps those muscles loose so there is less tension dragging on the tendon.
Shop the Massage BallKnow someone who cannot sleep on their side?
So many people put up with this for months, quietly exhausted, assuming it is just their hip wearing out and there is nothing to be done. If a partner, parent or friend keeps rolling over in the night, forward them this article. It might be the thing that finally gives them a full night's sleep.
When to get it checked.
Most outer hip pain at night is this tendon issue and responds well to taking the pressure off and gently building the hip back up. But see your GP or a physiotherapist if the pain came on suddenly after a fall or injury, if the hip is hot, red or swollen, if you have a fever, if the pain is deep in the groin or spreading down the leg with numbness or pins and needles, or if a sensible routine has not helped after a few weeks. A professional can confirm what is going on and, for stubborn cases, guide you through a tailored loading programme or other options.
Take the pressure off. Get your nights back.
Hip pain at night rarely needs anything dramatic. It needs the squeeze taken off the tendon while you sleep, and the hip gently rebuilt over the weeks that follow. A firm pillow between the knees does the first job from your very first night, and it costs less than a single physio session.
The tools
The Sports Medica Knee Pillow.
Firm, contoured memory foam that keeps your hips stacked and level all night, so the tendon stops getting squashed and you stop rolling over. Add the massage ball for daytime release, and you have the full system.
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References
- Minetto MA, et al. Increased adiposity and impaired sleep are associated with severity of greater trochanteric pain syndrome: a cross-sectional study. Frontiers in Medicine, 2025. frontiersin.org
- Grimaldi A, Fearon A. Gluteal tendinopathy: integrating pathomechanics and clinical features in its management. Journal of Orthopaedic & Sports Physical Therapy, 2015. jospt.org
- Gluteal Tendinopathy: epidemiology and compression pathomechanics. Physiopedia. physio-pedia.com
- Best sleeping positions for gluteal tendinopathy and hip bursitis, including the between-the-knees pillow strategy. Sports Injury Physio. sports-injury-physio.com
- Greater Trochanteric Pain Syndrome: diagnosis and management overview. Physiopedia. physio-pedia.com