Sleep bruxism — grinding or clenching your teeth while you sleep — is one of those things you can do every night for years without knowing, until a dentist spots the wear or a partner mentions the sound. It's common: a large 2024 global review put sleep bruxism at roughly one in five people across many populations, though estimates vary widely by how it's measured.
The signs (mostly noticed in the morning)
- A sore, tight jaw or facial muscle ache on waking.
- Morning headaches, often at the temples (see morning headaches).
- Tooth sensitivity, chips, flattened or worn surfaces — what dentists catch.
- A grinding or clicking sound a partner hears, or clicking in the jaw joint.
- Disrupted sleep — for you or whoever's next to you.
What actually causes it
Bruxism isn't simply "a bad habit." The main drivers are:
- Stress and anxiety — the biggest single association; tense days often mean clenched nights.
- Sleep arousals. Grinding frequently happens at the moment of a brief arousal from sleep — which is the thread that ties it to breathing problems.
- Lifestyle: caffeine, alcohol, nicotine and some medications increase it.
- Genetics and, in some people, the way the bite is aligned.
The link to sleep apnea worth knowing
Here's the connection most people miss: sleep bruxism is associated with obstructive sleep apnea. The grinding often coincides with the arousals that end an apnea event, so for some people the clenching is downstream of a breathing problem. This matters because if you tackle only the teeth (say, with a night guard) and miss underlying apnea, you protect the enamel but leave the real driver untreated. If you also snore loudly or wake gasping, mention the grinding and the breathing to your doctor.
A night guard saves your teeth. It doesn't fix why you're grinding — and sometimes the "why" is your breathing.
What helps
- See a dentist — a custom night guard protects your teeth and is the standard first step.
- Manage stress — the highest-yield lever for most people; wind-down routines, exercise, sometimes therapy.
- Trim the triggers — evening caffeine and alcohol especially.
- Screen for apnea if snoring or gasping is in the picture — treating it can reduce the grinding.
Where SleepTrace fits
Because grinding is audible, it's something you can actually observe. SleepTrace records your night on your iPhone and can surface the grinding sounds, show where they fall in the night, and — importantly — whether they line up with snoring and arousals. That helps you and your dentist or doctor see whether you're dealing with stress-driven bruxism or grinding that's tangled up with a breathing problem.
References
- Zieliński G, Pająk A, Wójcicki M. Global prevalence of sleep bruxism and awake bruxism in pediatric and adult populations: a systematic review and meta-analysis. J Clin Med (2024). Europe PMC
SleepTrace is a wellness app, not a medical device. This article is general information, not medical advice. If your symptoms are frequent, severe or worrying, please talk to a doctor.
Hear your own night. SleepTrace turns a night of audio into your sleep phases, the sounds you made, and how it all trends — no wearable, just the iPhone on your nightstand. Download on the App Store →