Some things just seem to go together naturally. Peanut butter and jelly. Baseball and hot dogs. Sleep problems and jaw pain.
Okay, maybe that last pairing doesn’t hit quite the same note as the others, but as a new study out of South Korea shows, insomnia appears to be a risk factor for TMJ disorders (TMD) – which themselves have been linked with obstructive sleep apnea (OSA), as we’ve previously explored.
Insomnia is more than just not being able to sleep. It’s also not being able to stay asleep. Using data from nearly 360,000 adults, researchers carefully tracked who developed TMD over the course of several years. They found that those who had been diagnosed with insomnia had a 36% higher risk of developing TMD compared to those without insomnia.
Even after accounting for age, lifestyle factors, and other conditions, insomnia remained a significant independent predictor of TMD.
Insomnia, the research team wrote, appears to act as “both a potential initiator and perpetuator of TMD-related pain, acting through neural, inflammatory, and psychological dysregulation.” In other words, poor sleep doesn’t just coincidentally happen alongside jaw problems. It seems to actively create conditions that make TMD more likely – and harder to resolve.
A few factors seem to be involved in this state of affairs, according to the study. For one, poor sleep triggers systemic inflammation, elevating markers such as C-reactive protein and inflammatory cytokines that amplify pain signalling. Lack of sleep also messes with the body’s natural pain inhibition systems, essentially lowering your pain threshold, making you more vulnerable to chronic pain conditions.
Psychological factors may be at work, too, since insomnia can increase stress reactivity, anxiety and depression – all of which can lead to more muscle tension, especially in the jaw and neck. That chronic tension puts ongoing stress on the jaw joints. This dynamic is also something we’ve looked at before on this blog.
What makes this relationship even more challenging is the fact that it goes both ways. Sleep problems can lead to TMD, but TMD can also worsen sleep quality. If you struggle with jaw pain, you may be quite familiar with struggling to find comfortable sleeping positions or how the pain itself can wake you throughout the night or keep you from falling asleep in the first place.
Talk about a vicious cycle! Breaking it requires addressing both issues – and possibly even more when you consider that insomnia and OSA also seem to be fairly common companions. Research has shown that anywhere from 40% to 60% of people with sleep apnea also have symptoms of insomnia.
This is why starting with a comprehensive evaluation matters so much. Someone who comes in reporting jaw pain may also be dealing with one or more types of sleep disorder. All of it needs to be addressed in a sensible way for long-lasting improvement in any of the conditions.
That’s why, when seeing a patient for the first time, we ask about both jaw symptoms and sleep quality. It’s why we look for signs of jaw issues and sleep disordered breathing in the clinical exam. All are potentially connected aspects of the same problem.
Treating one without evaluating and addressing the other can leave patients stuck in that pain-sleep disruption cycle. If the problem is singular – just TMD, just OSA – we know to stay watchful because of the higher risk of other disorders
“These findings,” conclude the authors of the Korean study,
underscore the importance of paying clinical attention to sleep-related complaints in dental and oral and maxillofacial care.
Indeed.