Updated September 5, 2026
If you wake up with more jaw pain after sleeping on your side, it is reasonable to wonder whether your sleeping position is making a temporomandibular disorder worse. But the evidence is much less clear than the common advice to “never sleep on your side with TMJ.”
Side sleeping has not been proven to cause TMD or universally worsen it. Some people may simply find that direct pressure from a pillow, hand or arm makes an already-sensitive jaw feel worse. Others sleep comfortably on their side without any increase in symptoms.
First, TMJ and TMD are not the same thing
The temporomandibular joint (TMJ) is the joint in front of each ear that connects the lower jaw to the skull.
Temporomandibular disorders (TMDs) are a group of more than 30 conditions involving the jaw joints, the muscles used for chewing and, in some cases, associated headaches.
TMD is therefore not simply an “inflamed” or “misaligned” jaw.
According to the National Institute of Dental and Craniofacial Research (NIDCR), injury can cause some TMDs, but in many cases the exact cause is unclear. Genetics, life and psychological stressors and differences in pain processing may all play a role.
If you have jaw pain but do not know what is causing it, start with our broader guide: Why Does My Jaw Hurt? Common Causes of Jaw Pain and What to Do.
Does side sleeping make TMD worse?
We do not have good evidence that side sleeping itself routinely worsens TMD.
In one comparative study, researchers looked at 100 people seeking treatment for TMD and 100 matched controls. The two groups did not differ in their preferred sleeping positions.
The researchers concluded that sleeping position appeared to have little or no significance in the development or maintenance of TMD symptoms.
Interestingly, people with TMD were more likely to report that they had changed their preferred sleeping position because of pain in the jaw, face, neck or shoulders.
That suggests an important possibility: jaw pain may change the way you sleep more often than the way you sleep causes the jaw disorder.
Why can side sleeping still feel worse for some people?
Lack of evidence that side sleeping causes TMD does not mean your individual sleeping position can never affect how you feel.
If your jaw is already tender, lying with the side of your face pressed firmly into a pillow may simply be uncomfortable. The same may be true if you sleep with your fist, wrist or forearm tucked directly under your jaw.
If you repeatedly notice that one position makes your symptoms worse, that pattern is worth paying attention to.
What we should not conclude is that the pressure is necessarily inflaming, misaligning or damaging the TMJ.
Is sleeping on your back better for TMJ pain?
Back sleeping may feel more comfortable for some people because neither side of the jaw is pressed directly against the pillow.
But there is not strong evidence showing that back sleeping treats TMD or that everyone with TMD should sleep this way.
If you are comfortable on your back and notice less morning jaw discomfort in that position, it is reasonable to use it.
If you sleep poorly on your back, however, there is little reason to force yourself into that position solely because you have TMD.
What if you have sleep apnea or significant snoring?
Sleeping-position advice can become more complicated when a person also has obstructive sleep apnea or another sleep-related breathing condition.
Some people with positional obstructive sleep apnea have more airway obstruction while sleeping on their backs. If a clinician has advised you to sleep on your side because of a breathing disorder, do not reverse that recommendation simply because of jaw discomfort.
In that situation, discuss both concerns with the clinician treating your sleep condition and the dentist, physician or orofacial-pain professional evaluating your jaw.
Is stomach sleeping bad for TMJ?
You may see stomach sleeping described online as the “worst” position for TMJ because it requires the head to remain turned to one side.
That claim is stronger than the research supports.
Stomach sleeping may feel uncomfortable for some people with jaw, neck or shoulder symptoms. But we do not have good evidence establishing it as a universal cause of TMD or proving that it damages the jaw joint.
Again, your symptoms provide useful information: if stomach sleeping consistently leaves your jaw or neck more painful, trying another position makes sense.
Should you avoid sleeping on the painful side?
Not automatically.
There is no established rule that everyone with one-sided TMD must sleep on the opposite side.
A simple experiment can be more useful:
- Notice how your jaw feels before bed.
- Pay attention to your usual sleeping position.
- Notice whether one side reliably produces worse symptoms the next morning.
- If it does, try reducing direct pressure or temporarily sleeping in another comfortable position.
- Look for a pattern over several nights rather than judging from one morning.
If changing position makes no difference, you do not need to keep chasing the “perfect” sleeping posture.
What kind of pillow is best for TMJ?
There is no pillow type that has been proven to treat TMD.
Memory foam, contour pillows and specially marketed “TMJ pillows” are sometimes promoted as therapeutic products, but the important goal is simpler: find a pillow that lets you sleep comfortably without forcing your head, neck or jaw into an uncomfortable position.
If you sleep on your side, you may want to pay attention to whether:
- your pillow presses firmly into the lower jaw
- you tuck a hand or fist beneath your jaw
- your head feels sharply tilted toward the mattress
- you wake with more neck or shoulder discomfort as well as jaw pain
Comfort matters more than finding a pillow marketed specifically for “TMJ alignment.”
Can TMD affect sleep even if sleeping position is not the cause?
Yes.
The relationship between TMD and sleep appears to be much more substantial than the evidence linking TMD to one particular sleeping position.
Research has repeatedly found associations between painful TMD and poorer sleep quality. People dealing with ongoing facial or jaw pain may have difficulty falling asleep, wake because of discomfort or simply feel less rested in the morning.
That means waking tired does not necessarily tell us that your pillow or sleeping side caused the jaw problem. Pain itself can interfere with restorative sleep.
What can you do before bed if your jaw is sore?
NIDCR recommends beginning TMD care with conservative, reversible approaches whenever appropriate.
Depending on the cause of your symptoms, simple measures may include:
- temporarily choosing softer foods during a painful flare
- applying comfortable heat or cold
- reducing gum chewing and other unnecessary jaw activity
- becoming more aware of daytime clenching
- using gentle jaw movement or exercises when appropriate
If you are interested in exercise, see our updated guide: Jaw Exercises for Teeth Grinding and Clenching: What May Help.
Do not force your mouth to open as widely as possible or repeatedly push through sharp pain in an attempt to “stretch out” the joint.
What if you clench or grind your teeth while sleeping?
Bruxism and TMD can occur together, but one does not automatically prove the other.
If you grind or clench your teeth during sleep, a night guard may be recommended primarily to protect the teeth from direct tooth-to-tooth wear and damage.
That is different from saying a guard will cure TMD, relax your jaw muscles, reposition the joint or stop sleep bruxism.
NIDCR notes that there is not a lot of evidence showing that intraoral appliances improve TMD pain. If one is used, it should not be designed to permanently change the bite, and an appliance that causes pain should be reassessed.
We explore that distinction in detail in Does a Night Guard Really Help With TMJ? What the Evidence Says.
Can you wear a night guard while sleeping on your side?
Yes. A properly fitted dental night guard does not require a particular sleeping position.
Sleeping on your side does not inherently prevent a guard from doing its primary job of separating opposing teeth.
If an appliance causes new jaw pain, tooth pain, persistent bite changes or another worsening symptom, however, do not assume the sleeping position is responsible. Stop and have the appliance and your symptoms evaluated.
When should morning jaw pain be evaluated?
Mild jaw discomfort sometimes settles with simple measures, but persistent or changing symptoms deserve a closer look.
Consider seeing a dentist or physician if you have:
- persistent or progressively worsening jaw pain
- jaw locking or increasingly limited mouth opening
- painful clicking or popping that affects function
- a sudden or persistent change in your bite
- significant tooth pain
- facial swelling, fever or signs of dental infection
- pain after an injury to the jaw or face
- numbness, weakness or unusual neurological symptoms
Clicking or popping without pain is common and generally does not require treatment on its own.
So, what is the best sleeping position for TMJ?
There is no scientifically established best sleeping position for every person with TMD.
If sleeping on your back feels comfortable and reduces pressure on a tender jaw, that may work well for you.
If you are a comfortable side sleeper and your jaw does not hurt more in that position, there is no good evidence that you need to stop.
And if one particular position repeatedly aggravates your symptoms, adjusting it is reasonable—even if research cannot tell us exactly why your individual jaw responds that way.
The bottom line
Side sleeping is not inherently “bad for TMJ.”
Current research does not show that a particular sleeping position causes or routinely maintains temporomandibular disorders. What it does show is that people with TMD frequently experience disturbed or poorer-quality sleep.
For some people, direct pressure on an already-sensitive jaw may be uncomfortable. In that case, changing position or adjusting the way your face rests against the pillow is a reasonable comfort measure.
But you do not need to fear your favorite sleeping position, buy a special “TMJ pillow” or force yourself to sleep on your back because an internet article says you are damaging your joint.
If morning jaw pain persists, the more useful question is not simply “Which side am I sleeping on?” but “What is causing my jaw pain in the first place?”
Sources
National Institute of Dental and Craniofacial Research (NIDCR). Temporomandibular Disorders (TMDs).
Göthe Mundt AK, Helkimo M, Magnusson T. Sleeping position and reported quality of sleep. A comparison between subjects demanding treatment for temporomandibular disorders and controls. Swedish Dental Journal. 2011.
Al-Jewair T, Shibeika D, Ohrbach R. Temporomandibular Disorders and Their Association with Sleep Disorders in Adults: A Systematic Review. Journal of Oral & Facial Pain and Headache. 2021.
Dreweck FDS, Soares S, Duarte J, et al. Association between painful temporomandibular disorders and sleep quality: A systematic review. Journal of Oral Rehabilitation. 2020.
Editor’s note: Updated September 5, 2026. This article was substantially revised to clarify that side sleeping has not been proven to cause or universally worsen TMD, remove unsupported claims that back sleeping is universally best or stomach sleeping is universally worst, correct TMJ/TMD terminology, distinguish individual comfort from joint damage, and update statements about night guards to reflect current evidence.
This article is for educational purposes and is not a substitute for individualized dental or medical care.