Why You Grind Your Teeth at Night

You didn’t know you were doing it until someone told you. Maybe your dentist pointed to the wear on your back teeth. Maybe your partner mentioned the sound. Maybe you just started waking up with a tight, aching jaw and a dull headache and put it together yourself. Either way, it’s unsettling – because it’s happening while you’re asleep, completely out of your reach, and you can’t exactly decide to stop.

You’ve probably got the mouthguard by now, or you’re thinking about it. And a guard is a sensible thing – it protects your teeth, and I’d never tell you not to see your dentist about it. But it protects the teeth from the grinding. It doesn’t touch why you’re grinding in the first place.

So let me offer what that why usually is.

Grinding is your jaw doing at night what a lot of us do all day: bracing. The jaw is one of the very first places the body clenches when it’s holding tight, holding ready. During the day you might catch it and let go. But at night there’s no catching it. Your body simply carries on doing what it does – and if it’s been running braced, that brace shows up in your jaw while you sleep. The grinding isn’t a sleep problem exactly. It’s a daytime holding pattern that doesn’t switch off just because you’ve gone to bed.

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That’s the part that tends to get missed. You’ve been treating the grinding as its own strange nighttime event. But it’s usually the same tension you carry all day, still running when your guard should be down. Which is why it tends to be worse in the heavier stretches of life and eases in the rare calm ones.

And here’s the bit I really want you to hear. You can’t fix this from your thinking, because you’re not even conscious when it happens. You can’t remind yourself to stop, or will your jaw to relax, or reason with a mouth that’s clenching while you’re asleep. The grip doesn’t live in your thoughts. It lives in the body, well below the reach of any instruction – which is exactly why the usual “just relax” advice does nothing here.

What does help is settling the body’s overall bracing during the day, so there’s less of it left to spill into the night. And that goes in through the body, gently. Two simple things. First, through the day, practise letting your jaw actually rest – lips together, back teeth apart with a small gap, tongue soft, on a slow out breath. The more your jaw learns that resting position while you’re awake, the more it tends to find it while you’re asleep. Second, in the wind-down before bed, don’t take a braced body to the pillow. Give yourself even a few minutes of slow breathing, out breath long, shoulders and jaw dropping, so your body goes to sleep already coming off guard rather than still holding on.

I’ll be straight with you – this is a practice, and a jaw that’s gripped for years won’t let go in a night. Keep the mouthguard while you work on it. But settling the daytime tension is how you get at the root, not just the symptom, and over time the grinding often quietens because there’s less to grind about.

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Your jaw isn’t malfunctioning in the night. It’s carrying a grip from the day, and when the day gets gentler, so do your nights.