The key to relaxing your jaw during sleep starts hours before bedtime and depends on a combination of positioning, muscle release, and retraining your resting jaw posture. Nighttime jaw clenching (called sleep bruxism) happens unconsciously, so you can’t simply decide to stop. Instead, you need to set up conditions that make clenching less likely and less damaging.
Train Your Jaw’s Resting Position
Most people don’t realize their teeth are touching throughout the day. The ideal resting position for your jaw follows a simple rule: lips together, teeth apart. A technique developed for orofacial pain management called the “N position” makes this easy to practice. Place the tip of your tongue against the roof of your mouth, just behind your front teeth, as if you’re about to say the letter “N.” Your teeth should be slightly separated and your lips barely touching. This position naturally prevents clenching because your jaw muscles can’t fully engage when your tongue is pressed to your palate.
Practice holding this position as much as possible during the day. The goal is to make it your default so your jaw carries less accumulated tension into the night. Many people clench during focused tasks like working at a computer or driving without noticing. Setting a few reminders on your phone to check in with your jaw throughout the day can help break that cycle. People who smoke, drink alcohol, or consume more than six cups of coffee daily are roughly twice as likely to grind their teeth, so cutting back on caffeine and alcohol in the hours before bed may also help.
Choose the Right Sleep Position
Stomach sleeping is the worst position for jaw tension. It forces you to turn your head to one side, twisting your neck and jaw out of alignment while pressing your jaw into the pillow. This puts direct pressure on the jaw joint and keeps surrounding muscles engaged all night.
Side sleeping can also be a problem, especially if you rest your hand under your cheek or jaw. That pushes your lower jaw into an unnatural position and creates sustained pressure on the joint. If you do sleep on your side, keep your hands away from your face and use a pillow that supports your head without pushing your jaw upward.
Back sleeping is the best option. It keeps your head, neck, and spine aligned, and nothing presses against your jaw. Use a supportive pillow that keeps your neck in a neutral position rather than pushing your chin toward your chest, which can tighten the muscles around your jaw.
Release Tension Before Bed
A short routine of jaw massage and stretching before sleep can significantly reduce the tension your muscles carry into the night.
Start with a masseter massage. Your masseter muscles sit just below your cheekbones and are the primary muscles used for clenching. Place two or three fingertips on the muscle below one cheekbone. If you clench your teeth lightly, you’ll feel the muscle bulge under your fingers. Now relax your jaw and press into the muscle, holding steady pressure for six to ten seconds. Move to a different spot on the muscle and repeat. Work through four or five different points on each side. If you find a particularly tender spot, spend extra time there. These tight spots are often where the muscle holds the most chronic tension.
Next, gently massage the muscles at the base of your skull where your neck meets your head. Use your fingertips to press in and move back and forth without sliding over the skin. One minute on each side is enough. These muscles connect to the same nerve network as your jaw, and releasing them helps the whole system relax.
Follow the massage with controlled jaw opening. Place your tongue on the roof of your mouth in the N position, then slowly open and close your jaw while keeping your tongue in place. This trains the jaw joint to move through its normal range without the muscles gripping. Six slow repetitions is a good target.
Use Progressive Muscle Relaxation
Progressive muscle relaxation works by deliberately tensing a muscle group, then releasing it, which triggers a deeper relaxation than you’d get from simply trying to “let go.” For your jaw specifically: bite down and pull the corners of your mouth downward, holding everything tight for about five seconds. Then release completely and take a slow breath. Repeat once more. The contrast between full tension and release helps your nervous system recognize what a truly relaxed jaw feels like.
You can do this as part of a full-body progressive relaxation sequence, working from your feet up to your face, which has the added benefit of calming your nervous system overall. Doing this in bed as you’re falling asleep gives your jaw the best chance of starting the night in a relaxed state.
Consider a Night Guard
A night guard won’t stop you from clenching, but it prevents your teeth from grinding against each other and can reduce the force your jaw muscles generate. Custom-fitted guards from a dentist provide the safest and most accurate fit because they’re molded to your specific teeth. Over-the-counter and online options are cheaper, but research published in the British Dental Journal has linked them to tissue damage, teeth shifting, and even choking risk because they don’t conform precisely to your bite.
If you wake up with a sore jaw, headaches near your temples, or your partner hears you grinding at night, a custom guard is worth the investment. It protects your teeth while you work on the underlying tension with the techniques above.
Check for Nutritional Gaps
Vitamin D deficiency shows a surprisingly strong link to sleep bruxism. In one study, 60% of people who grind their teeth had low vitamin D levels, compared to 34% of non-grinders. The connection makes physiological sense: vitamin D regulates calcium levels, and when calcium drops, nerve and muscle cells become more excitable, making involuntary muscle contractions like clenching more likely. Deficiency rates climb in step with bruxism severity, reaching 72% combined insufficiency and deficiency in people with the most severe grinding.
Magnesium deficiency contributes through a similar mechanism. Low magnesium increases the excitability of nerve fibers, including those in the trigeminal nerve that controls your jaw muscles. Symptoms of magnesium deficiency overlap heavily with bruxism triggers: anxiety, insomnia, muscle irritability, and headaches. If you suspect a deficiency, a simple blood test can confirm it, and supplementation is straightforward.
Rule Out Sleep Apnea
There’s a theory that some nighttime jaw clenching is actually your body’s attempt to keep your airway open. During obstructive sleep apnea, the airway partially collapses during sleep, and clenching the jaw may push the lower jaw forward enough to restore airflow. If you snore heavily, wake up gasping, or feel exhausted despite a full night’s sleep, the jaw clenching could be a symptom of a breathing problem rather than a standalone habit. Treating the apnea, typically with a device that keeps your airway open, often reduces or eliminates the clenching as a side effect.
Putting It All Together
The most effective approach combines several of these strategies rather than relying on any single one. During the day, practice the N position and notice when you’re clenching. In the evening, cut off caffeine and alcohol. Before bed, spend five minutes on masseter massage and controlled jaw opening, then use progressive muscle relaxation as you fall asleep on your back with proper neck support. Address any vitamin D or magnesium deficiency. And if you’re grinding hard enough to cause tooth damage or morning pain, get a custom night guard to protect your teeth while the behavioral changes take effect.