Part of IT band syndrome
IT band sleeping position: what to try tonight
Warning signs, and when to get help
What is the best IT band sleeping position?
The one your knee agrees to in the morning. Nobody has run a trial comparing sleeping positions for this condition, so anyone who names a single winner is guessing. Test two or three and let the knee cast the vote.
Three are worth testing, and each one is here for a reason. Two readers should read what follows the list before they choose, because for them the list is not a free choice: anyone more than about 28 weeks pregnant, and anyone who has had an operation on this knee or hip.
- On your back, leg long, nothing under the knee. The hip sits in neutral and the knee rests near straight, so neither of the two positions this condition cares about is being held for hours.
- On the pain-free side, with a firm cushion between the knees. The cushion needs to be thick enough that the top knee sits roughly level with the hip, because a thin one lets the top leg slide forward and across the body.
- On the painful side, if that is the only side you can sleep on, with a pillow supporting the whole thigh and lower leg so the tender spot at the outside of the knee is not taking your body weight.
If you are more than about 28 weeks pregnant, use the side set-up rather than the back one, and the pregnancy section at the end of this page gives the reason and the detail.
If you have had an operation on this knee or this hip, these three are not a free choice. Tonight, keep to the position you were given, keep using any brace, splint or wedge that came with it, and keep to the side you were told you may lie on. Do not change how you lie until the team that operated on you has said you can.
One of those instructions is the easiest to miss on a discharge sheet, which is whether the knee is meant to rest straight. Look for a splint or a brace and the setting it was handed to you at, or a line telling you to rest the leg out straight, and if your paperwork does not say either way, that is a question for the team rather than something to settle in bed. Knee operations differ on it, and after a hip replacement many surgeons ask you not to let the top leg cross the middle of your body for the first months. Nothing written here has seen your operation, and no page replaces your post-operative review.
Give each one about ten minutes before you decide, because the first thirty seconds of any new position feels strange. The real verdict comes later: a knee that is no sorer and no stiffer when you get out of bed is a knee that was lying well. If the position did not survive the night, change one thing and try again rather than rebuilding the whole bed.
Why side lying is the position that matters
Because side lying is the position that holds the hip away from neutral for hours at a time.
When you lie on one side without support, the top leg slides forward and drops across the midline of your body. That is hip adduction, and it is the movement this condition is associated with. Pepper and colleagues (2021) took 30 healthy adults and measured band stiffness with the hip in neutral and in 10 degrees of adduction, and stiffness was higher in adduction in the mid-thigh and lower parts of the band. That measurement comes with caveats: the participants were healthy volunteers and not people with the condition, it was a single measurement session, and stiffness is not pain. It is still the closest thing to a measurement anyone has on the position you hold for hours every night.
The other half of side lying is simpler. Lie on the sore side and the tender spot at the outside of the knee is pressed into the mattress by the weight of your leg and your pelvis. That is not a subtle mechanism, and it is why some people who swear by their left side cannot sleep on their right.
Which end of the thigh hurts changes the answer, so it is worth being sure which one you have. If your pain is at the bony point of the hip rather than at the outside of the knee, the structure under discussion is the gluteal tendons. Grimaldi and colleagues (2015) record that this condition interferes with sleep, side lying in particular, and name excessive compression and excessive hip adduction among its key factors, which is what lying on that hip and letting the top leg drop across the body both do. That version is covered on why outer hip pain is worse at night and on hip pain at night, and the greater trochanteric pain program covers the condition itself. The overlap is not a coincidence: both problems dislike the leg coming across the body, which is why one pillow helps both.
Should you put a pillow between your knees, or under them?
Between the knees, yes. Under the knee, think twice.
Between the knees is the easy one. The job of that cushion is to stop the top leg dropping forward and across, so its thickness matters more than its softness. Too thin and the leg slides off it within minutes; a firm cushion or a folded pillow that keeps the top knee level with the hip does the job. If you wake up having kicked it out, a longer body pillow that the whole lower leg rests on tends to stay put better than a small one.
Under the knee is the one people get given without a reason, and it deserves one. A pillow directly under the knee holds it at a comfortable bend all night, which is a position, not a rest. Whether that matters for this condition is reasoning and not evidence, and the next section sets out how far the evidence actually goes.
A third set-up gets less attention and is worth a try if neither works: lying on the painful side with the leg long and a pillow under the thigh and shin, which supports the leg without pressing on the tender spot and keeps the hip out of adduction at the same time.
Does the knee angle matter in bed?
Be careful here. The reasoning is sound and it runs further than the evidence does.
Here is what is measured. Fairclough and colleagues (2006) found on MRI that the band was compressed against the bony bump at the outside of the knee at 30 degrees of bend, as the shin turned inward, and that it moved away from the bump as the knee straightened. Muhle and colleagues (1999) examined the same corner at three knee positions, full extension, 30 degrees and 60 degrees, in six donated knees, and found no bursa in any of them, and no part of the joint lining on that side (the lateral synovial recess) reaching that bump at any of the three angles. So the knee angle is the variable this condition turns on, and the tissue it acts on is the fat layer under the band. That much is anatomy.
Here is the part that is not measured. No study has looked at what happens when a knee is held still at that angle all night, and none has compared a straighter knee with a bent one overnight in people with this condition. The measurements above come from imaging and dissection, not from beds. So the suggestion that a pillow parking your knee at roughly a quarter bend all night might not be doing it any favors is an inference from the compression angle. That is an inference, not a finding, and it is worth saying so out loud, because a sentence like that reads like evidence unless somebody labels it.
There is a second limit to it, and this one is anatomical. The compression Fairclough describes depends on tension in the band, and that tension comes from the muscles above it pulling and from the weight you are standing on. A leg lying on a mattress carries very little of either, so the same angle in bed is not the same loading as that angle on a stair. It is one more reason to treat the pillow point as something to try rather than something to obey.
One group should not try it at all. After a knee operation the resting angle is not yours to experiment with: some protocols want the knee resting out straight and hand you a splint or a brace to hold it there, others allow it bent, and after a meniscus repair or a ligament reconstruction there is often a limit on how far the knee may bend at all in the early weeks. Surgeons set that differently, so the only version that counts is the one your own team gave you. Losing the last few degrees of straightening is a known cost of a knee that rests bent for weeks, and it is harder to win back than it is to avoid, which is the reason the instruction exists.
An inference is something to test on yourself. If you sleep with a pillow under the knee and you wake with the outside of the knee sorer than you went to bed, move the pillow under the calf instead for three or four nights and see whether the mornings change. If nothing changes, you have learned that this does not apply to you, which is a real answer. And if no operation is involved and a bent knee is the only way you sleep at all, sleep. A run of sleepless nights is likely to cost you more than the pillow position does, and it is worth telling your physio that this is where you are rather than lying awake.
Why does IT band pain feel worse at night?
Most often because of what you did that day, not because of the night.
Geisler (2021) describes this condition as activity related, with sharp pain at one spot at the outside of the knee coming on after a period of running, and worse on downhill running and on stairs. Pain like that has a lag. A long run at lunchtime, or a hilly route, or the first week back on the bike, frequently shows up as an ache in the evening and a worse one at two in the morning. The night is reporting the day.
Then the position, which the sections above have already covered: hours of unbroken hip adduction if nothing is between the knees, or hours of direct pressure on the sore spot if you lie on it.
The third one is less interesting but real. At eleven at night the knee has no competition for your attention, so a level of discomfort you ignored at four in the afternoon is all there is to notice. That is not imagination and it is not a reason to dismiss it; it is a reason not to read a bad night as a sign the knee is getting worse.
None of this has been studied in this condition specifically, so treat the three together as practical reasoning. What it predicts is testable over a week: if your bad nights follow your hard days, the lever is the training rather than the bedding, and the IT band syndrome program sets out how much to cut back and what tells you it is settling.
What else helps before bed
A few things help, and none of them is dramatic.
Move the hard session earlier. A long run or a loaded session finished at eight in the evening leaves you going to bed on a knee that is still reacting, and the same session in the morning usually does not.
Do the hip work, but not as the last thing you do. The exercises are what change the condition over weeks, and doing them earlier in the evening gives the knee time to quieten before the lights go off.
Use the roller only if it helps you sleep, and treat it as comfort rather than treatment. IT band foam rolling shows where to roll and where not to, and the limits are worth repeating: keep off the bony point at the side of the hip, stop above the knee, and never roll over an area that is painful, swollen or bruised. If this leg has had an operation, keep the roller off it until your surgical team says the wound has healed and a roller is safe on it.
If you have a clotting or bleeding disorder, take blood-thinning medicine, have varicose veins, or have ever had a blood clot in the leg, check with your doctor or physio before you use a roller on it. Do not roll a leg that shows any of the blood clot signs in the warning list on this page. Get medical advice the same day, and call emergency services if you are also short of breath or have chest pain.
Try ice if it suits you. For a sore knee the NHS suggests an ice pack or a bag of frozen peas wrapped in a towel for up to 20 minutes every 2 to 3 hours, which some people find takes the edge off enough to drop off. Never put it on skin that cannot feel properly, and take it off before you fall asleep. If you have had an operation on the knee, ask your surgical team before you put ice over the wound or the dressing, because teams differ on that.
One habit from earlier in the day often shows up at night. Sitting with your legs crossed for a long evening holds the hip in the adduction position just as side lying does, and sitting and crossing your legs covers it properly.
When night pain is a reason to get checked rather than managed
A knee that grumbles when you turn over and settles when you move is ordinary. A few patterns are not, and this condition's own character is what makes them stand out: it is brought on by activity, so pain that is worst when you are doing nothing is the pattern that does not fit the label.
Pain at night or at rest that keeps getting worse is the central one, and the warning list below gives it several timings rather than one, depending on who you are: being treated for cancer now, having had cancer in the past, losing weight without trying, or still growing. Read those lines rather than a summary of them, because the timing is the point.
Two more mean a phone call the same day. A knee that is hot, red and swollen, or knee pain with a high temperature or feeling hot, cold or shivery. And a calf or thigh that is newly swollen or getting more swollen, warm, tender, red or darker than usual, which is in the list as a possible clot and is worth naming on a page about lying still, because reduced activity is part of how clots happen.
A knee that swells up, locks, gives way or clicks painfully is a same day item too, and it is the one most likely to be mistaken for a bad night. Those symptoms point inside the joint rather than at the band, and outer knee pain sets out what else lives at that corner of the knee.
If you have had an operation on this knee or hip, your own team's instructions outrank this page, including any position, brace or wedge you were given for nights, and new or worsening pain, swelling, redness or a leaking wound means contacting them the same day rather than waiting. Night pain after a knee replacement covers that version of the question, sleeping positions after a hip replacement covers the hip, and sleeping with a meniscus tear covers the torn cartilage version. A replaced hip that looks shorter or turned, or that clunks as though it slipped and went back, has its own lines in the warning list below, and both of them are faster than a physio appointment.
For judging all of this over days rather than hours, the pain monitoring model guide sets out how physios use a pain ceiling together with a next-morning check. For this condition our IT band syndrome program puts that ceiling at about 3 out of 10 at the outside of the knee, settled by the next morning. It works as well across a run of nights as it does across a training week.
If you are pregnant
One thing on this page changes in pregnancy, and it is the back position.
From about 28 weeks of pregnancy the NHS advises going to sleep on your side rather than on your back, because it says sleeping on your back after that point can double the risk of stillbirth. So use the side set-up described above, with a cushion between the knees thick enough to keep the top knee level with the hip, and leave lying on your back until after the birth. The NHS also says not to worry if you wake up on your back: settle onto your side again and carry on.
Beyond the position, pain on the outside of the knee or thigh that starts or changes during pregnancy is worth raising with your midwife or with a physio who sees pregnant patients instead of managing it from a general page. The list of likely causes is different in pregnancy, and so is what is safe to do about them, and neither of those is a judgment to make from reading.
Related exercise programs
Warning signs
Get emergency help now
- Emergency: pain, tingling, numbness or weakness in both legs, numbness or altered feeling around your genitals or bottom, or new trouble peeing or controlling your bladder or bowels. The same applies if you lose feeling in one leg. Call emergency services or go to an emergency department straight away. These can be signs of pressure on the nerves at the base of the spine (cauda equina syndrome).
- Emergency: the knee became very swollen very quickly, within a few hours of a twist, fall or blow, or you felt a pop or snap. Go to an emergency department straight away. Do not drive yourself: ask someone to drive you or call an ambulance.
- Emergency: your operated leg looks shorter than it did, or its foot turns in or out more than before, or the hip moves in an unusual way, even if the pain is not severe. Keep your weight off it and go to an emergency department straight away, and do not drive yourself. If you are in severe pain or cannot move the leg, call emergency services.
- Emergency: you are still growing and have pain that wakes you at night, pain at rest that keeps getting worse, or a lump or swelling around the knee or thigh that keeps growing. If you also have a rash that does not fade when you press it, call emergency services or go to an emergency department.
Get help today
- Same day: the knee swells up, locks so you cannot straighten it, gives way under you, or clicks painfully. These can be signs of a problem inside the joint, such as a torn meniscus (the cartilage cushion in the knee) or a ligament injury. Get medical advice the same day and stop running and riding until it has been checked.
- Same day: the knee is hot, red and swollen, or you have knee pain with a high temperature or feel hot, cold or shivery. Get medical advice the same day, and go to an emergency department if you feel very unwell. This can be a sign of infection in the joint, which needs treatment quickly.
- Same day: since your operation, your wound is oozing, leaking or has pus coming out of it, or its edges start to come apart, or your knee is tender, swollen, painful or red and it is not getting better or is getting worse, or you have a high temperature or feel hot and cold or shivery. Redness can be harder to see on brown or black skin. Contact your surgical team the same day, or get urgent medical advice if you cannot reach them. These can be signs of an infection in the wound or the knee joint. If you feel very unwell, go to an emergency department. If you have a very high or very low temperature, shivering you cannot control, you are breathing very fast or finding it hard to breathe, you are confused or your speech is slurred, your skin, lips or tongue look blue, gray, pale or blotchy (on brown or black skin this can be easier to see on the palms of the hands or soles of the feet), or you have a rash that does not fade when you press it, call emergency services, as this can be sepsis.
- Same day: you have had a hip replacement and your hip clunks and feels as if it partly slipped out of place and went back, even if it settles straight away and your leg looks normal. Stop the exercises, avoid the movement that brought it on, go back to your crutches or frame, and keep away from deep bending, crossing your legs and twisting on that leg until you have been seen. Contact your surgical team or get medical advice the same day. If the leg then looks shorter or turned, or you cannot move it or put weight on it, call emergency services.
- Same day: a calf or thigh that is newly swollen or getting more swollen, warm, tender, red or darker than usual, has swollen veins that are sore to touch, or has a throbbing or cramping pain that does not fit your injury or condition, or that feels different from normal muscle soreness after exercise. This can be a sign of a blood clot (deep vein thrombosis), especially after surgery, an injury, time in a cast or boot, a long trip or a spell of being much less mobile than usual. Get medical advice the same day. If you are also short of breath or have chest pain, call emergency services.
- Same day: pain at night or at rest that keeps getting worse. If you are being treated for cancer now, contact your cancer team the same day.
Book an appointment
- Within a day or two: you are still growing and have pain that wakes you at night, pain at rest that keeps getting worse, or a lump or swelling around the knee or thigh that keeps growing. See a doctor within a day or two. Ask for an urgent appointment rather than the next routine one, and say what the pain does at night and whether a lump is getting bigger. Do the same if the pain comes with looking pale, unusual tiredness, fevers with no clear cause, bruising or bleeding easily, or weight loss. Bone pain that is worse at night, or a new lump, needs checking to rule out rarer causes such as a bone tumor or a blood cancer (leukemia).
- Within a day or two: pain at night or at rest that keeps getting worse. If you have had cancer, now or in the past, see your doctor sooner, within a day or two, and mention it, even if the pain is not getting worse. Do the same if you have knee pain and are losing weight without trying, even if it does not hurt at night.
- Within a few days: pain at night or at rest that keeps getting worse. See your doctor within a few days.
- Within 2 weeks: pain that spreads from your lower back or buttock down the outside of the thigh or below the knee, especially with numbness, tingling or pins and needles in the leg or foot. The pain may be coming from your back rather than the knee. Book an appointment with a doctor or physio. If your leg or foot is getting weaker, for example your foot drags, catches on the ground or slaps down when you walk (foot drop), get medical advice the same day, and if the weakness is getting worse by the hour, go to an emergency department.
Common questions
What is the best way to sleep with IT band pain?
Whichever position leaves the outside of your knee no worse in the morning, because nobody has compared them in a study. Most people settle on one of two. On your back with the leg long and nothing under the knee itself, or on the pain-free side with a firm cushion between the knees thick enough that the top knee sits level with the hip rather than sliding forward and across. Give either one about ten minutes before you judge it, and judge it properly the next day. If you have had an operation on this knee or hip, your surgical team's instructions come first, including any brace, splint or wedge you were given for nights and which side you are allowed to lie on, and do not change how you lie until they have said you can. From about 28 weeks of pregnancy the NHS advises going to sleep on your side rather than on your back, because it says sleeping on your back after that point can double the risk of stillbirth. So use the side set-up with a cushion between the knees, and leave lying on your back until after the birth. The NHS also says not to worry if you wake up on your back: settle onto your side again and carry on.
Can you sleep on the side with IT band pain?
You can, and plenty of people have to, because most of us only sleep well one way. Two problems come with it, and both have a fix. Lying on the sore side puts your body weight straight onto the tender spot at the outside of the knee, which a pillow under the whole thigh and lower leg will often take off. Lying on the good side lets the top leg drop forward and across your body, and that is the position with a measurement against it, so put a cushion between the knees that is thick enough to keep the top knee level with the hip. If you have had a hip or knee operation, ask your surgical team which side you are allowed to lie on and whether the knee is meant to rest straight, because their answer outranks anything on this page. If your pain is higher up, at the bony point of the hip rather than the outside of the knee, why outer hip pain is worse at night is the page for that version.
Why is my IT band pain worse at night?
Usually because of the day rather than the night. Geisler (2021) describes this condition as coming on with activity, typically after a period of running and worse downhill and on stairs, so a long run or a hilly route often turns into an uncomfortable evening a few hours later. On top of that, side lying holds the hip in the one position with a measurement attached to it, and lying on the sore side presses the tender spot into the mattress for hours. Nobody has studied night pain in this condition specifically, so that is reasoning rather than a finding. Pain at night or at rest that keeps getting worse is the pattern that does not fit, and it has its own timed lines in the warning list at the foot of this page.
I am pregnant and my IT band hurts at night. What can I do?
Start with the side set-up rather than the back one, and get the position checked rather than worked out alone. From about 28 weeks of pregnancy the NHS advises going to sleep on your side rather than on your back, because it says sleeping on your back after that point can double the risk of stillbirth. So use the side set-up with a cushion between the knees, and leave lying on your back until after the birth. The NHS also says not to worry if you wake up on your back: settle onto your side again and carry on. A cushion between the knees that keeps the top knee level with the hip is the part that matters for the outside of the knee. New or changing hip, pelvis or leg pain in pregnancy is worth raising with your midwife or a physio who sees pregnant patients, because the likely causes are not the same list as they would be otherwise, and that conversation belongs with someone who can examine you.
References
- Pepper TM, Brismée JM, Sizer PS Jr, Kapila J, Seeber GH, Huggins CA, Hooper TL. The immediate effects of foam rolling and stretching on iliotibial band stiffness: a randomized controlled trial. International Journal of Sports Physical Therapy. 2021;16(3):651-661. https://doi.org/10.26603/001c.23606
- Fairclough J, Hayashi K, Toumi H, Lyons K, Bydder G, Phillips N, Best TM, Benjamin M. The functional anatomy of the iliotibial band during flexion and extension of the knee: implications for understanding iliotibial band syndrome. Journal of Anatomy. 2006;208(3):309-316. https://doi.org/10.1111/j.1469-7580.2006.00531.x
- Muhle C, Ahn JM, Yeh L, Bergman GA, Boutin RD, Schweitzer M, Jacobson JA, Haghighi P, Trudell DJ, Resnick D. Iliotibial band friction syndrome: MR imaging findings in 16 patients and MR arthrographic study of six cadaveric knees. Radiology. 1999;212(1):103-110. https://doi.org/10.1148/radiology.212.1.r99jl29103
- Geisler PR. Current Clinical Concepts: Synthesizing the Available Evidence for Improved Clinical Outcomes in Iliotibial Band Impingement Syndrome. Journal of Athletic Training. 2021;56(8):805-815. https://doi.org/10.4085/1062-6050-548-19
- Grimaldi A, Mellor R, Hodges P, Bennell K, Wajswelner H, Vicenzino B. Gluteal tendinopathy: a review of mechanisms, assessment and management. Sports Medicine. 2015;45(8):1107-1119. https://doi.org/10.1007/s40279-015-0336-5
- NHS. 27 weeks pregnant: the best sleeping positions during pregnancy. https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/2nd-trimester/week-27/
- NHS. Knee pain. Page last reviewed 21 December 2023. https://www.nhs.uk/symptoms/knee-pain/
Written and checked by the PocketPhysio editorial team. Last updated 2026-10-21.
This page is general education, not a diagnosis or a personal treatment plan. See a physiotherapist or doctor for advice about your own situation.